Frost dates for Richmond Wtr Wks, IN
At Richmond Wtr Wks, the median last spring frost (32°F) is Apr 24 and the median first fall frost is Oct 20, for a typical growing season of 180 days. For a 90% chance that the last frost has passed, wait until May 10. Nearby ZIP codes are in USDA hardiness zone 6a.
- Apr 24Last spring frost (median)50% chance of 32°F after this date
- May 10Safer planting date10% chance of 32°F after this date
- Oct 20First fall frost (median)50% chance of 32°F by this date
- 180 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 19 | May 3 | May 19 |
| 32°F | Apr 8 | Apr 24 | May 10 |
| 28°F | Mar 26 | Apr 10 | Apr 28 |
| 24°F | Mar 15 | Mar 30 | Apr 15 |
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 26 | Oct 10 | Oct 22 |
| 32°F | Oct 7 | Oct 20 | Nov 1 |
| 28°F | Oct 17 | Oct 30 | Nov 12 |
| 24°F | Oct 29 | Nov 9 | Nov 26 |
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 | 139 days | 160 days | 179 days |
| 32°F | 159 days | 180 days | 200 days |
| 28°F | 179 days | 202 days | 221 days |
| 24°F | 203 days | 225 days | 246 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 |
|---|---|---|---|
| 47374 | 6a | -10 to -5°F | 3 km |
| 47392 | 6a | -10 to -5°F | 8 km |
| 45347 | 6a | -10 to -5°F | 10 km |
| 47324 | 6a | -10 to -5°F | 13 km |
| 47341 | 6a | -10 to -5°F | 13 km |
| 47330 | 6a | -10 to -5°F | 14 km |
| 47393 | 6a | -10 to -5°F | 16 km |
| 47325 | 6a | -10 to -5°F | 21 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 USC00127370, at 39.8544, -84.8778, elevation 306 m (1,005 ft).
- Data quality: Standard (24+ years of data), 30 years of freeze data.
- Average days per year at or below 32°F: 117.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Cambridge City 3 N (26 km)
- Winchester Airport 3 E (35 km)
- New Castle 3 SW (44 km)
- Brookville (49 km)
- Farmland 5 NNW (50 km)
- Rushville (57 km)
- Muncie Delaware Co Airport (61 km)
- Portland 1 SW (63 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.