Indiana Frost Dates and Planting Zones
Across 969 ZIP codes we matched to a NOAA weather station, Indiana’s last spring frost (50% risk, 32°F) ranges from May 2 near Garrett 1 s to Mar 29 near Evansville Museum. First fall frost runs from Oct 9 near Cambridge City 3 n to Nov 10 near Evansville Museum. Look up your exact ZIP code on the frost date tool for a station-matched result and hardiness zone.
Frost dates by city in Indiana
The 12 weather stations covering the most IN ZIP codes, at the 50% and 10% probability levels (32°F threshold). The 10% date is later and safer to plant after; the 50% date is the typical planning date.
| Station | Last frost (50%) | Last frost (10%) | First frost (50%) | First frost (10%) |
|---|---|---|---|---|
| ft Wayne Intl ap | Apr 24 | May 10 | Oct 21 | Oct 8 |
| Castleton 2 s | Apr 18 | May 6 | Oct 26 | Oct 12 |
| Evansville Museum | Mar 29 | Apr 11 | Nov 10 | Oct 27 |
| Logansport Cicott st | Apr 20 | May 6 | Oct 23 | Oct 11 |
| Louisville Mcalpine | Mar 31 | Apr 14 | Nov 9 | Oct 31 |
| s Bend | Apr 23 | May 9 | Oct 23 | Oct 9 |
| Tipton 5 sw | Apr 23 | May 9 | Oct 17 | Oct 3 |
| Stendal | Apr 6 | Apr 23 | Oct 30 | Oct 16 |
| Indianapolis se Side | Apr 20 | May 5 | Oct 21 | Oct 7 |
| Cambridge City 3 n | Apr 27 | May 10 | Oct 9 | Sep 28 |
| New Castle 3 sw | Apr 27 | May 12 | Oct 17 | Oct 4 |
| Valparaiso Wtr Wks | Apr 22 | May 6 | Oct 25 | Oct 12 |
USDA hardiness zones in Indiana
Share of Indiana ZIP codes in each 2023 USDA Plant Hardiness Zone. 64.2% of IN ZIP codes moved to a different zone between the 2012 and 2023 maps, mostly warming as winter lows trended up.
| Zone (2023) | Share of IN ZIPs |
|---|---|
| 5b | 4.8% |
| 6a | 61% |
| 6b | 24.3% |
| 7a | 9.8% |
Climate is shifting
Averaged across IN stations with both normals periods, the last spring frost now lands about 1 day earlier than the 1981–2010 normal. First fall frost now lands about 4 days later, stretching or shrinking the frost-free season depending on the station.
Plan around your Indiana frost dates
Once you know your local last and first frost, these guides help you time the work around them: