Frost dates for Adrian 2 NNE, MI
At Adrian 2 NNE, the median last spring frost (32°F) is May 1 and the median first fall frost is Oct 15, for a typical growing season of 164 days. For a 90% chance that the last frost has passed, wait until May 17. Nearby ZIP codes are in USDA hardiness zone 6a.
- May 1Last spring frost (median)50% chance of 32°F after this date
- May 17Safer planting date10% chance of 32°F after this date
- Oct 15First fall frost (median)50% chance of 32°F by this date
- 164 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 13 | May 27 |
| 32°F | Apr 18 | May 1 | May 17 |
| 28°F | Apr 6 | Apr 20 | May 7 |
| 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 21 | Oct 3 | Oct 15 |
| 32°F | Oct 1 | Oct 15 | Oct 29 |
| 28°F | Oct 12 | Oct 27 | Nov 9 |
| 24°F | Oct 25 | Nov 6 | Nov 20 |
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 | 124 days | 143 days | 160 days |
| 32°F | 143 days | 164 days | 185 days |
| 28°F | 168 days | 189 days | 207 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% |
Closest ZIP codes (each is closer to another station)
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 49221 | 6a | -10 to -5°F | 4 km |
| 49268 | 6a | -10 to -5°F | 9 km |
| 49286 | 6a | -10 to -5°F | 13 km |
| 49287 | 6a | -10 to -5°F | 13 km |
| 49235 | 6a | -10 to -5°F | 16 km |
| 49265 | 6a | -10 to -5°F | 17 km |
| 49228 | 6a | -10 to -5°F | 17 km |
| 49279 | 6a | -10 to -5°F | 17 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 USC00200032, at 41.9164, -84.0158, elevation 232 m (760 ft).
- Data quality: Standard (24+ years of data), 29 years of freeze data.
- Average days per year at or below 32°F: 142.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Adrian Lenawee Co Airport (8 km)
- Tecumseh (12 km)
- Tipton 2wnw (15 km)
- Blissfield 1nne (15 km)
- Manchester (26 km)
- Morenci (27 km)
- Saline 4sw (28 km)
- Dundee (31 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.