Frost dates for Coldwater St. School, MI
At Coldwater St. School, the median last spring frost (32°F) is May 2 and the median first fall frost is Oct 13, for a typical growing season of 163 days. For a 90% chance that the last frost has passed, wait until May 18. Nearby ZIP codes are in USDA hardiness zone 6a.
- May 2Last spring frost (median)50% chance of 32°F after this date
- May 18Safer planting date10% chance of 32°F after this date
- Oct 13First fall frost (median)50% chance of 32°F by this date
- 163 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 29 | May 14 | May 29 |
| 32°F | Apr 18 | May 2 | May 18 |
| 28°F | Apr 6 | Apr 21 | May 8 |
| 24°F | Mar 28 | Apr 9 | Apr 24 |
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 19 | Oct 2 | Oct 15 |
| 32°F | Sep 30 | Oct 13 | Oct 30 |
| 28°F | Oct 12 | Oct 28 | Nov 9 |
| 24°F | Oct 27 | Nov 7 | 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 | 120 days | 141 days | 161 days |
| 32°F | 142 days | 163 days | 182 days |
| 28°F | 165 days | 187 days | 209 days |
| 24°F | 194 days | 213 days | 232 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 |
|---|---|---|---|
| 49036 | 6a | -10 to -5°F | 7 km |
| 49082 | 6a | -10 to -5°F | 10 km |
| 49094 | 6a | -10 to -5°F | 14 km |
| 49092 | 6a | -10 to -5°F | 15 km |
| 49028 | 6a | -10 to -5°F | 20 km |
| 49089 | 6a | -10 to -5°F | 20 km |
| 49029 | 6a | -10 to -5°F | 21 km |
| 49245 | 6a | -10 to -5°F | 25 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 USC00201675, at 41.9622, -84.9925, elevation 300 m (984 ft).
- Data quality: Standard (24+ years of data), 28 years of freeze data.
- Average days per year at or below 32°F: 136.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Hillsdale (29 km)
- Battle Creek Kellogg Airport (44 km)
- Battle Creek 5nw (50 km)
- Three Rivers (54 km)
- Jackson Reynolds Field (55 km)
- Kalamazoo Battle Ck Intl Airport (55 km)
- Gull Lake Biological Station (58 km)
- Charlotte (67 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.