Frost Dates and Planting Windows in Arizona

The 32°F frost dates at the 174 weather stations in Arizona with NOAA's 1991–2020 Climate Normals, and the planting windows they give. These are long-term statistics, not a forecast. For the dates at the station nearest you, enter your ZIP code.

Frost dates across Arizona

Each risk level uses a date with a set chance of frost. In spring, it's the chance of a 32°F frost on or after the last-frost date. In fall, it's the chance of the first 32°F frost on or before the first-frost date. At the Typical level (30%), the last frost ranges from January 9 to June 30 across the state, and the first frost from September 8 to January 1.

At 50 of these 174 stations, 32°F isn't reached every year. Their frost dates describe only the years when it is reached, and the ranges on this page include them.

32°F frost dates: earliest and latest among 174 stations, by risk level
Risk level	Earliest last frost	Latest last frost	Earliest first frost	Latest first frost
Conservative (10%)	January 22PHOENIX SKY HARBOR INTL AP, AZ US	July 7FLAGSTAFF 4 SW, AZ US	August 312 stations	December 18PHOENIX SKY HARBOR INTL AP, AZ US
Typical (30%)	January 9PHOENIX SKY HARBOR INTL AP, AZ US	June 30FLAGSTAFF 4 SW, AZ US	September 8FLAGSTAFF 4 SW, AZ US	January 1KOFA MINE, AZ US
Aggressive (50%)	January 43 stations	June 23FLAGSTAFF 4 SW, AZ US	September 15FLAGSTAFF 4 SW, AZ US	January 9KOFA MINE, AZ US

Growing season length

The growing season is the stretch between the last spring frost and the first fall frost at 32°F. NOAA gives it as a length with a chance of being at least that long. Each risk level uses the length with that chance of a shorter season, so Conservative shows the shortest lengths.

Growing season at 32°F: shortest and longest among 174 stations
Risk level	Shortest	Longest
Conservative (90% chance of at least this long)	59 daysFLAGSTAFF 4 SW, AZ US	358 daysPHOENIX SKY HARBOR INTL AP, AZ US
Typical (70% chance of at least this long)	73 daysFLAGSTAFF 4 SW, AZ US	365 days2 stations
Aggressive (50% chance of at least this long)	81 daysFLAGSTAFF 4 SW, AZ US	365 days3 stations

Number of stations by growing season length, Typical (70% chance of at least this long)
Growing season	Stations
60–79 days	2
80–99 days	6
100–119 days	8
120–139 days	10
140–159 days	13
160–179 days	14
180–199 days	19
200–219 days	19
220–239 days	13
240–259 days	11
260–279 days	12
280–299 days	15
300–319 days	12
320–339 days	10
340–359 days	8
360–379 days	2

Planting windows across Arizona

For each crop, the earliest start and the latest end of its Typical windows among the stations. A window at any one station is shorter and falls inside this span. Transplant dates are for seedlings. A fall window is left out at stations where it would start on or before the last day of the spring window, so some rows cover fewer stations.

Typical planting windows (30% frost dates): earliest start and latest end among stations
Crop and task	Earliest start	Latest end	Stations
Basil: Transplant outdoors	January 23	July 14	174 of 174
Bean: Sow outdoors	January 9	June 30	174 of 174
Beet: Sow outdoors	December 12	June 30	174 of 174
Beet: Sow for fall	June 24	November 12	170 of 174
Broccoli: Transplant outdoors	December 12	June 16	174 of 174
Broccoli: Transplant for fall	June 10	November 12	172 of 174
Brussels sprouts: Transplant outdoors	December 12	June 16	174 of 174
Brussels sprouts: Transplant for fall	May 30	November 22	166 of 174
Cabbage: Transplant outdoors	December 12	June 16	174 of 174
Cabbage: Transplant for fall	June 9	November 12	170 of 174
Cantaloupe: Transplant outdoors	January 23	July 14	174 of 174
Cantaloupe: Sow outdoors	January 23	July 14	174 of 174
Carrot: Sow outdoors	December 12	June 30	174 of 174
Carrot: Sow for fall	June 19	November 2	167 of 174
Cucumber: Transplant outdoors	January 16	July 7	174 of 174
Cucumber: Sow outdoors	January 9	June 30	174 of 174
Eggplant: Transplant outdoors	January 23	July 14	174 of 174
Garlic: Plant for fall	September 8	January 15	174 of 174
Lettuce: Transplant outdoors	December 12	June 16	174 of 174
Lettuce: Sow outdoors	December 12	June 16	174 of 174
Lettuce: Sow for fall	June 10	November 22	172 of 174
Onion: Transplant or plant sets	December 12	June 16	174 of 174
Peas: Sow outdoors	December 12	June 16	174 of 174
Peas: Sow for fall	June 17	November 12	173 of 174
Pepper: Transplant outdoors	January 23	July 14	174 of 174
Potato: Plant seed potatoes	December 12	June 30	174 of 174
Pumpkin: Sow outdoors	January 23	July 14	174 of 174
Radish: Sow outdoors	December 12	June 16	174 of 174
Radish: Sow for fall	July 21	December 12	174 of 174
Spinach: Transplant outdoors	December 12	June 16	174 of 174
Spinach: Sow outdoors	December 12	June 16	174 of 174
Spinach: Sow for fall	June 26	November 25	174 of 174
Summer squash: Transplant outdoors	January 16	July 7	174 of 174
Summer squash: Sow outdoors	January 9	June 30	174 of 174
Sweet corn: Sow outdoors	January 9	June 30	174 of 174
Sweet potato: Plant slips	January 16	July 14	174 of 174
Tomato: Transplant outdoors	January 23	July 14	174 of 174
Turnip: Sow outdoors	December 12	June 16	174 of 174
Turnip: Sow for fall	June 26	November 22	174 of 174
Watermelon: Transplant outdoors	January 23	July 14	174 of 174
Watermelon: Sow outdoors	January 23	July 14	174 of 174

Weather stations in Arizona

Every station in Arizona with NOAA frost-date normals, with its Typical 32°F frost dates and growing season. 1 of them have no 32°F frost dates.

Typical (30%) 32°F frost dates by station
Station	Elevation	Last frost	First frost	Growing season
AGUILA, AZ US	2,170 ft	March 31	November 14	230 days
AJO, AZ US32°F is reached in 81.1% of years here. Its frost dates describe only those years.	1,750 ft	January 27	December 10	331 days
ALAMO DAM, AZ US	1,290 ft	March 12	November 18	251 days
ALPINE, AZ US	8,050 ft	June 21	September 16	88 days
ANVIL RCH, AZ US	2,760 ft	April 5	November 2	215 days
APACHE JUNCTION 5 NE, AZ US32°F is reached in 98.5% of years here. Its frost dates describe only those years.	2,070 ft	February 21	December 1	288 days
ARIZONA CITY, AZ US	1,520 ft	March 5	November 15	257 days
BAGDAD, AZ US	3,940 ft	April 18	November 5	207 days
BEAVER DAM, AZ US	1,930 ft	March 22	November 13	239 days
BELLEMONT WFO, AZ US	7,150 ft	June 27	September 11	77 days
BENSON 6SE, AZ US	3,690 ft	April 19	October 26	194 days
BETATAKIN, AZ US	7,290 ft	May 14	October 8	149 days
BISBEE 1WNW, AZ US	5,560 ft	April 8	November 3	211 days
BLACK RVR PUMPS, AZ US	6,060 ft	May 23	October 7	141 days
BLUE RIDGE RS, AZ US	6,880 ft	June 4	September 28	117 days
BOUSE, AZ US32°F is reached in 99.9% of years here. Its frost dates describe only those years.	920 ft	February 28	November 22	272 days
BOWIE, AZ US	3,780 ft	April 8	November 1	207 days
BRIGHT ANGEL RS, AZ US	8,000 ft	June 10	September 21	104 days
BULLHEAD CITY, AZ US32°F is reached in 66.8% of years here. Its frost dates describe only those years.	530 ft	January 15	December 13	343 days
CANELO 1 NW, AZ US	5,010 ft	April 30	October 24	180 days
CANYON DE CHELLY, AZ US	5,610 ft	May 15	October 3	144 days
CAREFREE, AZ US32°F is reached in 97.6% of years here. Its frost dates describe only those years.	2,530 ft	February 20	December 6	295 days
CASA GRANDE NM, AZ US	1,420 ft	February 28	November 22	272 days
CASA GRANDE, AZ US32°F is reached in 98.6% of years here. Its frost dates describe only those years.	1,400 ft	February 17	November 29	291 days
CASCABEL, AZ US	3,190 ft	April 30	October 24	179 days
CASTLE HOT SPRINGS, AZ US32°F is reached in 83.1% of years here. Its frost dates describe only those years.	1,990 ft	February 2	December 12	325 days
CATALINA SP, AZ US	2,710 ft	April 8	November 4	211 days
CHANDLER HEIGHTS, AZ US32°F is reached in 98.8% of years here. Its frost dates describe only those years.	1,420 ft	February 12	December 3	300 days
CHILDS, AZ US	2,650 ft	April 10	November 5	213 days
CHINO VALLEY, AZ US	4,750 ft	May 4	October 17	169 days
CHIRICAHUA NM, AZ US	5,300 ft	April 22	November 1	195 days
CLIFTON, AZ US	3,520 ft	March 6	November 18	259 days
COLORADO CITY, AZ US	5,000 ft	May 3	October 19	171 days
CORDES, AZ US	3,770 ft	April 12	November 9	209 days
CORONADO NMEM, AZ US	5,240 ft	April 15	November 2	203 days
DATELAND WHITEWING RCH, AZ US32°F is reached in 97.9% of years here. Its frost dates describe only those years.	520 ft	February 7	December 6	307 days
DIAMOND M RCH, AZ US	5,490 ft	May 25	October 5	138 days
DOUGLAS BISBEE INL AP, AZ US	4,100 ft	April 19	October 29	195 days
DOUGLAS, AZ US	4,040 ft	March 31	November 5	224 days
DUNCAN, AZ US	3,660 ft	April 30	October 19	174 days
E MESA, AZ US32°F is reached in 98.2% of years here. Its frost dates describe only those years.	1,520 ft	February 12	December 2	298 days
EHRENBERG 2 E, AZ US32°F is reached in 83.3% of years here. Its frost dates describe only those years.	460 ft	January 15	December 12	337 days
ELGIN 5 S, AZ US	4,810 ft	April 24	October 27	187 days
ELOY 4 NE, AZ US	1,540 ft	March 3	November 21	260 days
FLAGSTAFF 4 SW, AZ US	7,130 ft	June 30	September 8	73 days
FLAGSTAFF PULLIAM AP, AZ US	7,000 ft	June 10	September 23	108 days
FLORENCE, AZ US32°F is reached in 95.2% of years here. Its frost dates describe only those years.	1,400 ft	February 10	December 4	305 days
FOUNTAIN HILLS, AZ US32°F is reached in 63.3% of years here. Its frost dates describe only those years.	1,580 ft	January 21	December 18	344 days
FT HUACHUCA PIONEER AIRFIELD, AZ US	4,770 ft	March 31	November 14	232 days
FT THOMAS 2 SW, AZ US	2,830 ft	April 7	October 31	208 days
FT VALLEY, AZ US	7,350 ft	June 19	September 19	89 days
GANADO, AZ US	6,340 ft	May 23	October 4	139 days
GILA BEND 2SE, AZ US32°F is reached in 96.9% of years here. Its frost dates describe only those years.	790 ft	February 2	December 3	309 days
GLOBE #3, AZ US	3,660 ft	March 18	November 15	242 days
GRAND CANYON E ENTRANCE, AZ US	7,480 ft	May 16	October 14	155 days
GRAND CANYON NP 2, AZ US	6,790 ft	June 5	September 29	115 days
GRAND CANYON NP AP, AZ US	6,610 ft	June 23	September 19	90 days
GRAND CANYON VISITOR CTR, AZ US	7,080 ft	May 9	October 21	166 days
GREEN VALLEY, AZ US	2,900 ft	March 4	November 20	264 days
GREER, AZ US	8,270 ft	June 10	September 23	106 days
HAPPY JACK RS, AZ US	7,480 ft	June 5	September 29	116 days
HEBER (BLACK MESA) RS, AZ US	6,590 ft	May 30	October 1	126 days
HOLBROOK, AZ US	5,080 ft	April 29	October 18	175 days
JEROME, AZ US	4,950 ft	April 5	November 17	229 days
KARTCHNER CAVERNS, AZ US	4,690 ft	March 31	November 9	225 days
KEAMS CANYON, AZ US	6,210 ft	May 25	October 5	136 days
KINGMAN MOHAVE CO AP, AZ US	3,420 ft	April 10	November 5	210 days
KITT PEAK, AZ US	6,790 ft	May 4	October 28	182 days
KOFA MINE, AZ US32°F is reached in 15.9% of years here. Its frost dates describe only those years.	1,770 ft	January 20	January 1	365 days
LAKE HAVASU CITY, AZ US32°F is reached in 49.1% of years here. Its frost dates describe only those years.	450 ft	January 15	December 21	355 days
LAVEEN 3 SSE, AZ US32°F is reached in 84.5% of years here. Its frost dates describe only those years.	1,130 ft	January 29	December 12	330 days
LEES FERRY, AZ US	3,210 ft	March 12	November 15	246 days
LITCHFIELD PARK, AZ US32°F is reached in 76.8% of years here. Its frost dates describe only those years.	1,040 ft	January 18	December 16	339 days
LUKACHUKAI, AZ US	6,520 ft	May 10	October 11	155 days
MARICOPA 4 N, AZ US	1,160 ft	March 3	November 18	263 days
MC NARY 2N, AZ US	7,340 ft	May 26	October 5	134 days
MC NEAL, AZ US	4,170 ft	April 14	November 2	206 days
MEADVIEW 1W, AZ US	2,940 ft	March 13	November 22	255 days
METEOR CRATER, AZ US	5,540 ft	May 10	October 15	162 days
MIAMI, AZ US	3,560 ft	March 5	November 24	266 days
MONTEZUMA CASTLE NM, AZ US	3,180 ft	April 24	October 24	187 days
MONUMENT VALLEY, AZ US	5,500 ft	April 17	October 27	194 days
MORMON FLAT, AZ US32°F is reached in 87.4% of years here. Its frost dates describe only those years.	1,710 ft	February 6	December 15	320 days
MT LEMMON WILLOW CANYON, AZ US	7,030 ft	April 8	November 11	218 days
MUND'S PARK, AZ US	6,470 ft	June 17	September 22	98 days
NATURAL BRG, AZ US	4,610 ft	April 20	November 2	199 days
NOGALES 6 N, AZ US	3,460 ft	April 24	October 28	190 days
NOGALES INTL AP, AZ US	3,930 ft	March 31	November 9	227 days
OAK CREEK CANYON, AZ US	5,120 ft	April 23	October 28	192 days
ORACLE 2 SE, AZ US	4,510 ft	April 4	November 14	229 days
ORACLE SP, AZ US	4,600 ft	April 6	November 5	214 days
ORGAN PIPE CACTUS NM, AZ US32°F is reached in 95.9% of years here. Its frost dates describe only those years.	1,680 ft	February 17	December 6	301 days
PAGE MUNI AP, AZ US	4,310 ft	March 16	November 10	241 days
PAGE, AZ US	4,270 ft	April 4	November 3	216 days
PAINTED DESERT NP, AZ US	5,760 ft	May 7	October 14	161 days
PAINTED ROCK DAM, AZ US32°F is reached in 96% of years here. Its frost dates describe only those years.	570 ft	February 3	December 7	313 days
PARADISE, AZ US	5,460 ft	April 28	October 22	180 days
PARKER, AZ US32°F is reached in 88.4% of years here. Its frost dates describe only those years.	420 ft	January 27	December 11	325 days
PAYSON, AZ US	4,850 ft	May 7	October 19	167 days
PEARCE - SUNSITES, AZ US	4,350 ft	April 21	October 28	191 days
PETRIFIED FOREST NP, AZ US	5,450 ft	May 11	October 10	153 days
PHANTOM RCH, AZ US	2,530 ft	February 20	November 30	285 days
PHOENIX DEER VALLEY MUNI AP, AZ US32°F is reached in 70.2% of years here. Its frost dates describe only those years.	1,460 ft	January 23	December 15	341 days
PHOENIX SKY HARBOR INTL AP, AZ US32°F is reached in 17.5% of years here. Its frost dates describe only those years.	1,110 ft	January 9	December 30	365 days
PICACHO 8 SE, AZ US32°F is reached in 99% of years here. Its frost dates describe only those years.	1,980 ft	February 18	December 1	295 days
PINETOP 2E, AZ US	7,200 ft	May 28	October 2	130 days
PINNACLE PEAK, AZ US32°F is reached in 91% of years here. Its frost dates describe only those years.	2,560 ft	February 13	December 11	311 days
PIPE SPRING NM, AZ US	4,920 ft	May 8	October 13	160 days
PLEASANT VALLEY, AZ US	5,180 ft	May 15	October 14	155 days
PORTAL 4 SW, AZ US	5,390 ft	May 8	October 19	167 days
PRESCOTT LOVE FLD, AZ US	5,040 ft	April 28	October 21	179 days
PRESCOTT, AZ US	5,210 ft	May 6	October 15	164 days
PUNKIN CTR, AZ US	2,330 ft	March 14	November 14	244 days
QUARTZSITE, AZ US32°F is reached in 98.6% of years here. Its frost dates describe only those years.	880 ft	February 9	December 1	301 days
ROBSON RCH, AZ US32°F is reached in 99.9% of years here. Its frost dates describe only those years.	1,500 ft	February 21	November 26	285 days
ROOSEVELT 1 S, AZ US32°F is reached in 82.4% of years here. Its frost dates describe only those years.	2,600 ft	February 2	December 15	328 days
SAFFORD AG CTR, AZ US	2,950 ft	April 3	November 3	216 days
SAFFORD MUNI AP, AZ US	3,180 ft	March 16	November 14	243 days
SAGUARO NP, AZ US32°F is reached in 93.3% of years here. Its frost dates describe only those years.	3,080 ft	February 6	December 8	310 days
SAINT JOHNS, AZ US	5,790 ft	May 7	October 9	157 days
SAN CARLOS RESERVOIR, AZ US	2,530 ft	March 24	November 13	235 days
SAN MANUEL, AZ US32°F is reached in 99.5% of years here. Its frost dates describe only those years.	3,420 ft	February 16	December 1	293 days
SAN SIMON, AZ US	3,580 ft	April 23	October 27	187 days
SANDERS, AZ US	5,850 ft	June 1	October 2	128 days
SANTA RITA EXP RANGE, AZ US32°F is reached in 99.8% of years here. Its frost dates describe only those years.	4,300 ft	March 9	November 27	266 days
SASABE, AZ US	3,590 ft	March 31	November 13	232 days
SCOTTSDALE MUNI AP, AZ US32°F is reached in 70.4% of years here. Its frost dates describe only those years.	1,470 ft	January 18	December 17	341 days
SEDONA, AZ US	4,220 ft	April 10	November 9	218 days
SELIGMAN, AZ US	5,250 ft	May 17	October 8	145 days
SHOW LOW AP, AZ US	6,410 ft	May 10	October 9	153 days
SIERRA VISTA, AZ US	4,610 ft	April 11	November 2	207 days
SNOWFLAKE, AZ US	5,640 ft	May 17	October 5	140 days
SONOITA, AZ US	4,900 ft	April 7	November 15	224 days
SOUTH PHOENIX, AZ US32°F is reached in 93.6% of years here. Its frost dates describe only those years.	1,150 ft	February 3	December 8	316 days
SPRINGERVILLE, AZ US	7,000 ft	June 7	September 21	106 days
ST JOHNS INDUSTRIAL AP, AZ US	5,730 ft	May 9	October 6	152 days
STEWART MTN DAM, AZ US32°F is reached in 99.7% of years here. Its frost dates describe only those years.	1,420 ft	February 24	November 28	282 days
SUNRISE MTN, AZ US	9,370 ft	June 23	September 12	83 days
SUNSET CRATER NM, AZ US	6,980 ft	June 21	September 13	85 days
SUPERIOR, AZ US32°F is reached in 76.8% of years here. Its frost dates describe only those years.	2,860 ft	February 3	December 15	326 days
TACNA 3 NE, AZ US32°F is reached in 99.8% of years here. Its frost dates describe only those years.	320 ft	February 23	November 25	276 days
TEEC NOS POS, AZ US	5,290 ft	April 19	October 25	189 days
TEMPE ASU, AZ US32°F is reached in 99.7% of years here. Its frost dates describe only those years.	1,170 ft	February 24	November 29	284 days
TEMPLE BAR, AZ US32°F is reached in 99.6% of years here. Its frost dates describe only those years.	1,280 ft	February 13	December 5	296 days
TOHONO CHUL, AZ US	2,530 ft	March 5	November 27	268 days
TOMBSTONE, AZ US	4,660 ft	March 16	November 22	250 days
TUBA CITY, AZ US	4,990 ft	April 24	October 22	183 days
TUCSON 11 W, AZ US32°F is reached in 99.3% of years here. Its frost dates describe only those years.	2,730 ft	February 21	December 2	290 days
TUCSON 17 NW, AZ US32°F is reached in 99.8% of years here. Its frost dates describe only those years.	2,560 ft	March 5	November 29	272 days
TUCSON CAMP AVE EXP, AZ US	2,330 ft	March 1	November 20	269 days
TUCSON INTL AP, AZ US32°F is reached in 98.9% of years here. Its frost dates describe only those years.	2,550 ft	February 17	November 30	293 days
TUCSON U OF A #1, AZ US	2,310 ft	February 22	November 26	281 days
TUCSON WFO, AZ US32°F is reached in 92.3% of years here. Its frost dates describe only those years.	2,440 ft	February 2	December 9	317 days
TUMACACORI NM, AZ US	3,270 ft	April 13	November 3	206 days
TUZIGOOT, AZ US	3,470 ft	April 6	November 4	214 days
TWIN ARROWS, AZ US	5,810 ft	April 22	October 19	183 days
WAHWEAP, AZ US	3,730 ft	March 25	November 11	233 days
WALNUT CANYON NM, AZ US	6,690 ft	May 20	October 2	138 days
WALNUT CREEK, AZ US	5,090 ft	June 1	October 2	125 days
WICKENBURG, AZ US	2,100 ft	March 18	November 14	241 days
WIKIEUP, AZ US	2,010 ft	April 2	November 16	232 days
WILLCOX, AZ US	4,170 ft	April 16	October 26	194 days
WILLIAMS 35 NNW, AZ US	5,990 ft	May 15	October 11	152 days
WILLIAMS, AZ US	6,910 ft	May 31	October 1	126 days
WILLOW BEACH, AZ US32°F is reached in 62.9% of years here. Its frost dates describe only those years.	740 ft	January 15	December 22	348 days
WINDOW ROCK AP, AZ US	6,740 ft	June 2	September 23	114 days
WINSLOW MUNI AP, AZ US	4,890 ft	May 3	October 13	166 days
WITTMANN 1SE, AZ US32°F is reached in 98.9% of years here. Its frost dates describe only those years.	1,680 ft	February 16	December 2	291 days
WUPATKI NM, AZ US	4,910 ft	April 17	October 27	196 days
YOUNGTOWN, AZ US32°F is reached in 95.2% of years here. Its frost dates describe only those years.	1,130 ft	February 2	December 8	316 days
YUCCA 1 NNE, AZ US32°F is reached in 99.9% of years here. Its frost dates describe only those years.	1,950 ft	February 28	November 25	276 days
YUMA 27 ENE, AZ US32°F is reached in 76.4% of years here. Its frost dates describe only those years.	620 ft	January 31	December 13	332 days
YUMA MCAS, AZ US	210 ft	Not calculated: frost this cold is too rare at this station	Not calculated: frost this cold is too rare at this station	Not calculated: frost this cold is too rare at this station
YUMA PROVING GROUND, AZ US32°F is reached in 57.1% of years here. Its frost dates describe only those years.	320 ft	January 16	December 15	348 days
YUMA QUARTERMASTER DEPOT, AZ US32°F is reached in 57% of years here. Its frost dates describe only those years.	160 ft	January 31	December 21	349 days

Data sources

NOAA U.S. Climate Normals, frost dates, 1991–2020 normals, version 1.0.1: Files: us-climate-normals_1991-2020_v1.0.1_annualseasonal_multivariate_by-station_c20230404.tar.gz, inventory_30yr.txt from NOAA NCEI. Retrieved October 10, 2026.