Frost dates for Hart 3 WSW, MI
At Hart 3 WSW, the median last spring frost (32°F) is May 12 and the median first fall frost is Oct 10, for a typical growing season of 151 days. For a 90% chance that the last frost has passed, wait until May 28. Nearby ZIP codes are in USDA hardiness zones 6a to 6b.
- May 12Last spring frost (median)50% chance of 32°F after this date
- May 28Safer planting date10% chance of 32°F after this date
- Oct 10First fall frost (median)50% chance of 32°F by this date
- 151 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 | May 7 | May 24 | Jun 6 |
| 32°F | Apr 25 | May 12 | May 28 |
| 28°F | Apr 14 | Apr 30 | May 20 |
| 24°F | Mar 31 | Apr 18 | May 8 |
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 14 | Sep 29 | Oct 13 |
| 32°F | Sep 25 | Oct 10 | Oct 26 |
| 28°F | Oct 8 | Oct 25 | Nov 7 |
| 24°F | Oct 22 | Nov 7 | Nov 24 |
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 | 106 days | 128 days | 150 days |
| 32°F | 129 days | 151 days | 174 days |
| 28°F | 151 days | 174 days | 199 days |
| 24°F | 176 days | 202 days | 228 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 |
|---|---|---|---|
| 49436 | 6b | -5 to 0°F | 4 km |
| 49455 | 6a | -10 to -5°F | 8 km |
| 49420 | 6a | -10 to -5°F | 12 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 USC00203632, at 43.6747, -86.4239, elevation 235 m (770 ft).
- Data quality: Representative (10+ years), 23 years of freeze data.
- Average days per year at or below 32°F: 151.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Montague 4 NW (24 km)
- Ludington 4 SE (26 km)
- Hesperia 4 WNW (27 km)
- Fremont 4 WSW (41 km)
- Muskegon Co Airport (58 km)
- Manistee 3se (61 km)
- Grand Haven Wastewater Plant (71 km)
- Wellston 1n (72 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.