Frost dates for Monroe, MI
At Monroe, the median last spring frost (32°F) is Apr 23 and the median first fall frost is Oct 23, for a typical growing season of 182 days. For a 90% chance that the last frost has passed, wait until May 7. Nearby ZIP codes are in USDA hardiness zone 6b.
- Apr 23Last spring frost (median)50% chance of 32°F after this date
- May 7Safer planting date10% chance of 32°F after this date
- Oct 23First fall frost (median)50% chance of 32°F by this date
- 182 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 20 | May 2 | May 16 |
| 32°F | Apr 8 | Apr 23 | May 7 |
| 28°F | Mar 31 | Apr 14 | Apr 27 |
| 24°F | Mar 18 | Apr 2 | Apr 17 |
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 28 | Oct 11 | Oct 26 |
| 32°F | Oct 9 | Oct 23 | Nov 5 |
| 28°F | Oct 21 | Nov 4 | Nov 18 |
| 24°F | Nov 2 | Nov 15 | Dec 1 |
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 | 143 days | 162 days | 181 days |
| 32°F | 162 days | 182 days | 202 days |
| 28°F | 185 days | 204 days | 224 days |
| 24°F | 207 days | 227 days | 248 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 |
|---|---|---|---|
| 48161 | 6b | -5 to 0°F | 5 km |
| 48162 | 6b | -5 to 0°F | 6 km |
| 48145 | 6b | -5 to 0°F | 8 km |
| 48157 | 6b | -5 to 0°F | 10 km |
| 48133 | 6b | -5 to 0°F | 15 km |
| 48182 | 6b | -5 to 0°F | 19 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 USC00205563, at 41.9069, -83.4158, elevation 179 m (586 ft).
- Data quality: Representative (10+ years), 14 years of freeze data.
- Average days per year at or below 32°F: 128.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Newport 4sse (12 km)
- Carleton 2w (18 km)
- Dundee (20 km)
- Milan 4 ESE (24 km)
- Milan Wastewater Plant (29 km)
- Detroit Metro Airport (37 km)
- Detroit Willow Run Airport (38 km)
- Blissfield 1nne (38 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.