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Frost Dates and Planting Windows in Maine

The 32°F frost dates at the 82 weather stations in Maine 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.

The planner uses the weather station nearest your ZIP code.

Frost dates across Maine

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 April 26 to June 8 across the state, and the first frost from September 6 to October 19.

32°F frost dates: earliest and latest among 82 stations, by risk level
Risk levelEarliest last frostLatest last frostEarliest first frostLatest first frost
Conservative (10%)May 2WOODLAND, ME USJune 21ALLAGASH, ME USAugust 292 stationsOctober 10TENANTS HARBOR, ME US
Typical (30%)April 26WOODLAND, ME USJune 8ALLAGASH, ME USSeptember 6CLAYTON LAKE, ME USOctober 192 stations
Aggressive (50%)April 21WOODLAND, ME USJune 2ALLAGASH, ME USSeptember 13CLAYTON LAKE, ME USOctober 26WOODLAND, ME 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 82 stations
Risk levelShortestLongest
Conservative (90% chance of at least this long)76 daysALLAGASH, ME US165 daysWOODLAND, ME US
Typical (70% chance of at least this long)94 daysALLAGASH, ME US176 daysWOODLAND, ME US
Aggressive (50% chance of at least this long)102 daysALLAGASH, ME US185 daysWOODLAND, ME US
Number of stations by growing season length, Typical (70% chance of at least this long)
Growing seasonStations
80–99 days2
100–119 days11
120–139 days30
140–159 days27
160–179 days12

Planting windows across Maine

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 taskEarliest startLatest endStations
Basil: Transplant outdoorsMay 10June 2282 of 82
Bean: Sow outdoorsApril 26June 882 of 82
Beet: Sow outdoorsMarch 29June 882 of 82
Beet: Sow for fallJune 14August 3082 of 82
Broccoli: Transplant outdoorsMarch 29May 2582 of 82
Broccoli: Transplant for fallJune 4August 3082 of 82
Brussels sprouts: Transplant outdoorsMarch 29May 2582 of 82
Brussels sprouts: Transplant for fallMay 21September 980 of 82
Cabbage: Transplant outdoorsMarch 29May 2582 of 82
Cabbage: Transplant for fallMay 30August 3082 of 82
Cantaloupe: Transplant outdoorsMay 10June 2282 of 82
Cantaloupe: Sow outdoorsMay 10June 2282 of 82
Carrot: Sow outdoorsMarch 29June 882 of 82
Carrot: Sow for fallJune 10August 2080 of 82
Cucumber: Transplant outdoorsMay 3June 1582 of 82
Cucumber: Sow outdoorsApril 26June 882 of 82
Eggplant: Transplant outdoorsMay 10June 2282 of 82
Garlic: Plant for fallSeptember 6November 282 of 82
Lettuce: Transplant outdoorsMarch 29May 2582 of 82
Lettuce: Sow outdoorsMarch 29May 2582 of 82
Lettuce: Sow for fallJune 4September 982 of 82
Onion: Transplant or plant setsMarch 29May 2582 of 82
Peas: Sow outdoorsMarch 29May 2582 of 82
Peas: Sow for fallJune 12August 3082 of 82
Pepper: Transplant outdoorsMay 10June 2282 of 82
Potato: Plant seed potatoesMarch 29June 882 of 82
Pumpkin: Sow outdoorsMay 10June 2282 of 82
Radish: Sow outdoorsMarch 29May 2582 of 82
Radish: Sow for fallJuly 19September 2982 of 82
Spinach: Transplant outdoorsMarch 29May 2582 of 82
Spinach: Sow outdoorsMarch 29May 2582 of 82
Spinach: Sow for fallJune 24September 1282 of 82
Summer squash: Transplant outdoorsMay 3June 1582 of 82
Summer squash: Sow outdoorsApril 26June 882 of 82
Sweet corn: Sow outdoorsApril 26June 882 of 82
Sweet potato: Plant slipsMay 3June 2282 of 82
Tomato: Transplant outdoorsMay 10June 2282 of 82
Turnip: Sow outdoorsMarch 29May 2582 of 82
Turnip: Sow for fallJune 24September 982 of 82
Watermelon: Transplant outdoorsMay 10June 2282 of 82
Watermelon: Sow outdoorsMay 10June 2282 of 82

Weather stations in Maine

Every station in Maine with NOAA frost-date normals, with its Typical 32°F frost dates and growing season.

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.