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Frost Dates in Indiana
First and last frost dates across Indiana, computed from 64 NOAA weather stations (1991–2020 climate normals). Your exact date depends on your city and microclimate — use the ZIP lookup on the main tool for a station-specific answer.
Last spring frost
Apr 23
statewide median · range Apr 2–May 2
First fall frost
Oct 21
statewide median · range Oct 10–Nov 7
Growing season
180 days
median · range 159–218
Stations used
64
NOAA 1991–2020 normals
Frost dates by city
Median dates from the nearest NOAA station to each city. The "cautious" date is the 10% spring value — planting after it means only a ~10% chance of a later frost.
| City | Nearest station | Last spring frost | First fall frost | Growing season | Safe transplant |
|---|---|---|---|---|---|
| Indianapolis | Indianapolis · 8 mi | Apr 15 (cautious: May 2) | Oct 26 | 193 days | Apr 29 |
| Fort Wayne | Ft Wayne Intl Ap · 8 mi | Apr 24 (cautious: May 10) | Oct 21 | 178 days | May 8 |
| Evansville | Evansville Rgnl Ap · 6 mi | Apr 4 (cautious: Apr 19) | Oct 29 | 206 days | Apr 18 |
How frost varies across Indiana
Spring frost timing spans about 30 days across the state. Cannelton in southern Indiana typically sees its last spring frost around April 2, while Garrett in northeastern Indiana doesn't clear frost until about May 2. Within any city, low spots and valleys run colder than the station average; areas near buildings and pavement run warmer.
When to plant in Indiana
As a rule of thumb, cool-season crops (lettuce, peas, spinach) can go in 2–4 weeks before your last spring frost; warm-season transplants (tomatoes, peppers) should wait about 2 weeks after it — around May 7 for the statewide median. Check your city's row above rather than the statewide median: a 30-day statewide spread makes the city-level date the one that matters.
These are climate normals (what's typical), not forecasts. For the current year, watch the 10-day forecast around your planting date.
How this is computed
Statewide medians are the median of the 64 NOAA stations' median frost dates — half the stations run earlier, half later. City rows use the nearest station with 30-year freeze records. Dates are 32°F freeze probabilities from NOAA NCEI 1991–2020 U.S. Climate Normals; nothing is estimated or interpolated.
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Frequently asked questions
When is the last frost date in Indiana?
The statewide median last spring frost is April 23, but it ranges from April 2 to May 2 depending on where in the state you are. Use your city's row in the table above, or the ZIP lookup on the main tool, for a station-specific date.
When can I plant tomatoes outside in Indiana?
Warm-season transplants like tomatoes should wait about two weeks after your last spring frost — around May 7 for the statewide median. Your city may differ by weeks; check the "safe transplant" column in the city table.
How long is the growing season in Indiana?
The median growing season across 64 NOAA stations is 180 days, ranging from 159 to 218 days by location.
Why do frost dates vary so much within Indiana?
Frost timing follows latitude, elevation, and local terrain. Across Indiana, last spring frost dates span about 30 days — from around April 2 near Cannelton to May 2 near Garrett. Microclimates (low spots, valleys, urban heat) shift dates further at the garden level.
Where does this data come from?
All frost dates are computed from the NOAA National Centers for Environmental Information 1991–2020 U.S. Climate Normals freeze data (public domain), using each station's 32°F freeze probability statistics. No dates are estimated or interpolated.