Frost dates for E Grand Rapids, MI
At E Grand Rapids, the median last spring frost (32°F) is May 6 and the median first fall frost is Oct 10, for a typical growing season of 157 days. For a 90% chance that the last frost has passed, wait until May 23. Nearby ZIP codes are in USDA hardiness zone 6a.
- May 6Last spring frost (median)50% chance of 32°F after this date
- May 23Safer planting date10% chance of 32°F after this date
- Oct 10First fall frost (median)50% chance of 32°F by this date
- 157 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 3 | May 18 | May 31 |
| 32°F | Apr 24 | May 6 | May 23 |
| 28°F | Apr 11 | Apr 27 | May 13 |
| 24°F | Mar 31 | Apr 15 | May 1 |
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 1 | Oct 12 |
| 32°F | Sep 29 | Oct 10 | Oct 25 |
| 28°F | Oct 8 | Oct 23 | Nov 7 |
| 24°F | Oct 21 | Nov 5 | Nov 23 |
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 | 117 days | 136 days | 155 days |
| 32°F | 138 days | 157 days | 176 days |
| 28°F | 158 days | 178 days | 199 days |
| 24°F | 182 days | 203 days | 226 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 |
|---|---|---|---|
| 49506 | 6a | -10 to -5°F | 1 km |
| 49507 | 6a | -10 to -5°F | 4 km |
| 49503 | 6a | -10 to -5°F | 5 km |
| 49505 | 6a | -10 to -5°F | 7 km |
| 49509 | 6a | -10 to -5°F | 8 km |
| 49548 | 6a | -10 to -5°F | 9 km |
| 49504 | 6a | -10 to -5°F | 9 km |
| 49525 | 6a | -10 to -5°F | 10 km |
| 49519 | 6a | -10 to -5°F | 10 km |
| 49418 | 6a | -10 to -5°F | 14 km |
| 49534 | 6a | -10 to -5°F | 14 km |
| 49544 | 6a | -10 to -5°F | 16 km |
| 49306 | 6a | -10 to -5°F | 16 km |
| 49428 | 6a | -10 to -5°F | 18 km |
| 49315 | 6a | -10 to -5°F | 18 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 USC00202375, at 42.9378, -85.6131, elevation 227 m (746 ft).
- Data quality: Estimated from nearby stations (2+ years), 5 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
- Grand Rapids (7 km)
- Nwsfo Grand Rapids (7 km)
- Kent City 2 SW (32 km)
- Greenville 2 NNE (42 km)
- Hastings (42 km)
- Allegan 5ne (42 km)
- Ionia 2ssw (44 km)
- Holland Tulip City Airport (45 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.