Indiana Frost Dates & Growing Zones by City
Indianapolis is the only Indiana city with frost dates on this site so far. Its typical (50%) last spring frost is Apr 20, and its typical frost-free season is 183 days.
By the 2023 USDA hardiness map, these cities are in zones 6a and 6b.
Dates come from the nearest NOAA station to each city that meets our quality rules, as the methodology explains.
| City | Last frost (50%) | First frost (50%) | Season (days, 50%) | Zone 2023 | Confidence | Planting calendar |
|---|---|---|---|---|---|---|
| Indianapolis frost dates | Apr 20 | Oct 21 | 183 | 6a–6b | High | Indianapolis planting calendar |
Station match, data and rules: methodology. Long-term odds, not a forecast.