Frost dates for Manchester, MI
At Manchester, the median last spring frost (32°F) is Apr 30 and the median first fall frost is Oct 14, for a typical growing season of 165 days. For a 90% chance that the last frost has passed, wait until May 16. Nearby ZIP codes are in USDA hardiness zone 6a.
- 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 14First fall frost (median)50% chance of 32°F by this date
- 165 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 10 | May 26 |
| 32°F | Apr 16 | Apr 30 | May 16 |
| 28°F | Apr 6 | Apr 19 | May 5 |
| 24°F | Mar 25 | Apr 7 | Apr 22 |
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 3 | Oct 16 |
| 32°F | Oct 1 | Oct 14 | Oct 29 |
| 28°F | Oct 11 | Oct 27 | Nov 10 |
| 24°F | Oct 24 | Nov 7 | Nov 22 |
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 | 123 days | 144 days | 162 days |
| 32°F | 144 days | 165 days | 185 days |
| 28°F | 166 days | 188 days | 210 days |
| 24°F | 193 days | 213 days | 234 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 |
|---|---|---|---|
| 48158 | 6a | -10 to -5°F | 1 km |
| 49263 | 6a | -10 to -5°F | 13 km |
| 49261 | 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 USC00205050, at 42.1508, -84.0236, elevation 294 m (965 ft).
- Data quality: Representative (10+ years), 18 years of freeze data.
- Average days per year at or below 32°F: 148.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Tipton 2wnw (15 km)
- Saline 4sw (17 km)
- Tecumseh (18 km)
- Chelsea (20 km)
- Saline Wastewater Plant (20 km)
- Ann Arbor Muni Airport (24 km)
- Adrian 2 NNE (26 km)
- Ann Arbor SE (29 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.