Frost dates for Grand Haven Wastewater Plant, MI
At Grand Haven Wastewater Plant, the median last spring frost (32°F) is Apr 30 and the median first fall frost is Oct 24, for a typical growing season of 175 days. For a 90% chance that the last frost has passed, wait until May 16. Nearby ZIP codes are in USDA hardiness zones 6a to 6b.
- Apr 30Last spring frost (median)50% chance of 32°F after this date
- May 16Safer planting date10% chance of 32°F after this date
- Oct 24First fall frost (median)50% chance of 32°F by this date
- 175 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 26 | May 13 | May 30 |
| 32°F | Apr 17 | Apr 30 | May 16 |
| 28°F | Apr 4 | Apr 18 | May 6 |
| 24°F | Mar 22 | Apr 6 | Apr 21 |
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 25 | Oct 9 | Oct 25 |
| 32°F | Oct 5 | Oct 24 | Nov 6 |
| 28°F | Oct 21 | Nov 5 | Nov 22 |
| 24°F | Nov 2 | Nov 20 | Dec 8 |
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 | 127 days | 150 days | 172 days |
| 32°F | 151 days | 175 days | 194 days |
| 28°F | 179 days | 200 days | 221 days |
| 24°F | 205 days | 225 days | 251 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 |
|---|---|---|---|
| 49409 | 6b | -5 to 0°F | 2 km |
| 49456 | 6b | -5 to 0°F | 3 km |
| 49417 | 6b | -5 to 0°F | 7 km |
| 49448 | 6a | -10 to -5°F | 11 km |
| 49460 | 6b | -5 to 0°F | 15 km |
| 49404 | 6a | -10 to -5°F | 21 km |
| 49401 | 6a | -10 to -5°F | 22 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 USC00203295, at 43.0608, -86.2047, elevation 184 m (605 ft).
- Data quality: Estimated from nearby stations (2+ years), 10 years of freeze data.
- Average days per year at or below 32°F: 134.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Muskegon Co Airport (13 km)
- Holland Water Plant (29 km)
- Holland Tulip City Airport (36 km)
- Kent City 2 SW (38 km)
- Fremont 4 WSW (45 km)
- Montague 4 NW (48 km)
- E Grand Rapids (50 km)
- Grand Rapids (57 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.