Frost dates for Rockville, IN
At Rockville, the median last spring frost (32°F) is Apr 30 and the median first fall frost is Oct 12, for a typical growing season of 164 days. For a 90% chance that the last frost has passed, wait until May 15. Nearby ZIP codes are in USDA hardiness zones 5b to 6a.
- Apr 30Last spring frost (median)50% chance of 32°F after this date
- May 15Safer planting date10% chance of 32°F after this date
- Oct 12First fall frost (median)50% chance of 32°F by this date
- 164 daysGrowing season (median)between 32°F freezes
Last spring frost dates
The chance that the temperature drops to the threshold after each date.
| Temperature | 90% chance later | 50% chance later | 10% chance later |
|---|---|---|---|
| 36°F | Apr 25 | May 10 | May 27 |
| 32°F | Apr 14 | Apr 30 | May 15 |
| 28°F | Apr 4 | Apr 18 | May 5 |
| 24°F | Mar 21 | Apr 5 | Apr 23 |
First fall frost dates
The chance that the temperature has dropped to the threshold by each date.
| Temperature | 10% chance by | 50% chance by | 90% chance by |
|---|---|---|---|
| 36°F | Sep 20 | Oct 2 | Oct 13 |
| 32°F | Sep 30 | Oct 12 | Oct 24 |
| 28°F | Oct 8 | Oct 22 | Nov 2 |
| 24°F | Oct 18 | Nov 1 | Nov 18 |
Growing season length
Days between the last spring and first fall freeze, as the length reached in 9, 5 and 1 out of 10 years.
| Temperature | 9 in 10 years at least | 5 in 10 years at least | 1 in 10 years at least |
|---|---|---|---|
| 36°F | 123 days | 144 days | 164 days |
| 32°F | 142 days | 164 days | 184 days |
| 28°F | 164 days | 185 days | 206 days |
| 24°F | 186 days | 210 days | 233 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 47872 | 6a | -10 to -5°F | 5 km |
| 47860 | 6a | -10 to -5°F | 10 km |
| 47862 | 6a | -10 to -5°F | 10 km |
| 47832 | 6a | -10 to -5°F | 14 km |
| 47874 | 6a | -10 to -5°F | 14 km |
| 47859 | 6a | -10 to -5°F | 14 km |
| 47854 | 6a | -10 to -5°F | 17 km |
| 47837 | 6a | -10 to -5°F | 18 km |
| 47989 | 5b | -15 to -10°F | 21 km |
| 47966 | 6a | -10 to -5°F | 22 km |
| 47847 | 6a | -10 to -5°F | 23 km |
Not the official USDA Plant Hardiness Zone Map. Zones shown here are the values published in the USDA-ARS / Oregon State University PRISM Group 2023 ZIP code tables, shown unaltered. For the official interactive map, visit planthardiness.ars.usda.gov.
About this station
- NOAA station ID USC00127522, at 39.7594, -87.2269, elevation 210 m (689 ft).
- Data quality: Representative (10+ years), 25 years of freeze data.
- Average days per year at or below 32°F: 111.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Greencastle 1 W (33 km)
- Terre Haute Hulman Regional Airport (35 km)
- Terre Haute Caa Airport (35 km)
- Terre Haute Indiana State (36 km)
- Perrysville 4 WNW (42 km)
- Crawfordsville 6 SE (45 km)
- Jamestown 2 E (57 km)
- Attica 2e (58 km)
Sources
- NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, annual/seasonal normals by station (version 1.0.1), file dated June 27, 2023; documentation.
- USDA Agricultural Research Service and PRISM Group, Oregon State University, 2023 Plant Hardiness Zone Map ZIP code tables (CONUS, Alaska, Hawaii, Puerto Rico), files dated November 17, 2023. Data © PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed November 1, 2026. Official map: planthardiness.ars.usda.gov.
- U.S. Census Bureau, 2024 Gazetteer ZIP Code Tabulation Areas file, dated August 30, 2024 (ZIP centroids used to find the nearest station).
Freeze dates are 30-year probabilities, not forecasts. Check your local forecast before planting tender plants.