Frost dates for Richmond 4 NNW, MI
At Richmond 4 NNW, the median last spring frost (32°F) is May 1 and the median first fall frost is Oct 20, for a typical growing season of 170 days. For a 90% chance that the last frost has passed, wait until May 17. Nearby ZIP codes are in USDA hardiness zone 6a.
- May 1Last spring frost (median)50% chance of 32°F after this date
- May 17Safer planting date10% chance of 32°F after this date
- Oct 20First fall frost (median)50% chance of 32°F by this date
- 170 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 27 | May 10 | May 25 |
| 32°F | Apr 18 | May 1 | May 17 |
| 28°F | Apr 5 | Apr 19 | May 4 |
| 24°F | Mar 21 | Apr 6 | Apr 19 |
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 24 | Oct 6 | Oct 20 |
| 32°F | Oct 4 | Oct 20 | Nov 3 |
| 28°F | Oct 17 | Nov 1 | Nov 14 |
| 24°F | Oct 31 | Nov 12 | Nov 27 |
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 | 131 days | 149 days | 166 days |
| 32°F | 150 days | 170 days | 191 days |
| 28°F | 171 days | 194 days | 214 days |
| 24°F | 199 days | 220 days | 242 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 |
|---|---|---|---|
| 48062 | 6a | -10 to -5°F | 3 km |
| 48041 | 6a | -10 to -5°F | 7 km |
| 48063 | 6a | -10 to -5°F | 9 km |
| 48005 | 6a | -10 to -5°F | 10 km |
| 48050 | 6a | -10 to -5°F | 10 km |
| 48027 | 6a | -10 to -5°F | 11 km |
| 48002 | 6a | -10 to -5°F | 12 km |
| 48096 | 6a | -10 to -5°F | 16 km |
| 48064 | 6a | -10 to -5°F | 16 km |
| 48065 | 6a | -10 to -5°F | 20 km |
| 48003 | 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 USC00206982, at 42.8783, -82.7958, elevation 233 m (765 ft).
- Data quality: Representative (10+ years), 16 years of freeze data.
- Average days per year at or below 32°F: 143.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Yale 1 NNW (30 km)
- Mount Clemens Ang Base (30 km)
- Port Huron (32 km)
- Algonac Wastewater Plant (36 km)
- Pontiac Wastewater Plant (46 km)
- Lapeer Wastewater Plant (46 km)
- Lexington Water Plant (48 km)
- Lapeer 2w (50 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.