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Frost Dates and Planting Windows in Indiana

The 32°F frost dates at the 117 weather stations in Indiana 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 Indiana

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 2 to May 8 across the state, and the first frost from October 4 to November 4.

32°F frost dates: earliest and latest among 117 stations, by risk level
Risk levelEarliest last frostLatest last frostEarliest first frostLatest first frost
Conservative (10%)April 11EVANSVILLE MUSEUM, IN USMay 18LAKEVILLE, IN USSeptember 262 stationsOctober 28CANNELTON, IN US
Typical (30%)April 2EVANSVILLE MUSEUM, IN USMay 8GARRETT 1 S, IN USOctober 4CAMBRIDGE CITY 3 N, IN USNovember 4EVANSVILLE MUSEUM, IN US
Aggressive (50%)March 29EVANSVILLE MUSEUM, IN USMay 2GARRETT 1 S, IN USOctober 9CAMBRIDGE CITY 3 N, IN USNovember 10EVANSVILLE MUSEUM, IN 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 117 stations
Risk levelShortestLongest
Conservative (90% chance of at least this long)141 daysGARRETT 1 S, IN US204 daysEVANSVILLE MUSEUM, IN US
Typical (70% chance of at least this long)152 daysGARRETT 1 S, IN US217 daysEVANSVILLE MUSEUM, IN US
Aggressive (50% chance of at least this long)159 daysGARRETT 1 S, IN US225 daysEVANSVILLE MUSEUM, IN US
Number of stations by growing season length, Typical (70% chance of at least this long)
Growing seasonStations
140–159 days9
160–179 days72
180–199 days32
200–219 days4

Planting windows across Indiana

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.

Typical planting windows (30% frost dates): earliest start and latest end among stations
Crop and taskEarliest startLatest endStations
Basil: Transplant outdoorsApril 16May 22117 of 117
Bean: Sow outdoorsApril 2May 8117 of 117
Beet: Sow outdoorsMarch 5May 8117 of 117
Beet: Sow for fallJuly 12September 15117 of 117
Broccoli: Transplant outdoorsMarch 5April 24117 of 117
Broccoli: Transplant for fallJuly 2September 15117 of 117
Brussels sprouts: Transplant outdoorsMarch 5April 24117 of 117
Brussels sprouts: Transplant for fallJune 12September 25117 of 117
Cabbage: Transplant outdoorsMarch 5April 24117 of 117
Cabbage: Transplant for fallJune 27September 15117 of 117
Cantaloupe: Transplant outdoorsApril 16May 22117 of 117
Cantaloupe: Sow outdoorsApril 16May 22117 of 117
Carrot: Sow outdoorsMarch 5May 8117 of 117
Carrot: Sow for fallJuly 2September 5117 of 117
Cucumber: Transplant outdoorsApril 9May 15117 of 117
Cucumber: Sow outdoorsApril 2May 8117 of 117
Eggplant: Transplant outdoorsApril 16May 22117 of 117
Garlic: Plant for fallOctober 4November 18117 of 117
Lettuce: Transplant outdoorsMarch 5April 24117 of 117
Lettuce: Sow outdoorsMarch 5April 24117 of 117
Lettuce: Sow for fallJuly 2September 25117 of 117
Onion: Transplant or plant setsMarch 5April 24117 of 117
Peas: Sow outdoorsMarch 5April 24117 of 117
Peas: Sow for fallJuly 10September 15117 of 117
Pepper: Transplant outdoorsApril 16May 22117 of 117
Potato: Plant seed potatoesMarch 5May 8117 of 117
Pumpkin: Sow outdoorsApril 16May 22117 of 117
Radish: Sow outdoorsMarch 5April 24117 of 117
Radish: Sow for fallAugust 16October 15117 of 117
Spinach: Transplant outdoorsMarch 5April 24117 of 117
Spinach: Sow outdoorsMarch 5April 24117 of 117
Spinach: Sow for fallJuly 22September 28117 of 117
Summer squash: Transplant outdoorsApril 9May 15117 of 117
Summer squash: Sow outdoorsApril 2May 8117 of 117
Sweet corn: Sow outdoorsApril 2May 8117 of 117
Sweet potato: Plant slipsApril 9May 22117 of 117
Tomato: Transplant outdoorsApril 16May 22117 of 117
Turnip: Sow outdoorsMarch 5April 24117 of 117
Turnip: Sow for fallJuly 22September 25117 of 117
Watermelon: Transplant outdoorsApril 16May 22117 of 117
Watermelon: Sow outdoorsApril 16May 22117 of 117

Weather stations in Indiana

Every station in Indiana 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.