Frost dates for Dundee, MI
At Dundee, the median last spring frost (32°F) is Apr 27 and the median first fall frost is Oct 21, for a typical growing season of 176 days. For a 90% chance that the last frost has passed, wait until May 13. Nearby ZIP codes are in USDA hardiness zones 6a to 6b.
- Apr 27Last spring frost (median)50% chance of 32°F after this date
- May 13Safer planting date10% chance of 32°F after this date
- Oct 21First fall frost (median)50% chance of 32°F by this date
- 176 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 23 | May 6 | May 22 |
| 32°F | Apr 14 | Apr 27 | May 13 |
| 28°F | Apr 3 | Apr 16 | May 2 |
| 24°F | Mar 20 | Apr 4 | Apr 18 |
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 26 | Oct 8 | Oct 21 |
| 32°F | Oct 6 | Oct 21 | Nov 1 |
| 28°F | Oct 19 | Nov 1 | Nov 14 |
| 24°F | Nov 1 | 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 | 135 days | 154 days | 172 days |
| 32°F | 156 days | 176 days | 193 days |
| 28°F | 178 days | 198 days | 217 days |
| 24°F | 204 days | 222 days | 243 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 |
|---|---|---|---|
| 48131 | 6a | -10 to -5°F | 2 km |
| 49270 | 6a | -10 to -5°F | 9 km |
| 48140 | 6a | -10 to -5°F | 10 km |
| 48177 | 6b | -5 to 0°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 USC00202308, at 41.9553, -83.6489, elevation 201 m (660 ft).
- Data quality: Representative (10+ years), 15 years of freeze data.
- Average days per year at or below 32°F: 131.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Milan 4 ESE (13 km)
- Milan Wastewater Plant (14 km)
- Monroe (20 km)
- Carleton 2w (21 km)
- Blissfield 1nne (22 km)
- Saline 4sw (23 km)
- Tecumseh (24 km)
- Saline Wastewater Plant (25 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.