Frost dates for Filion 5nnw, MI
At Filion 5nnw, the median last spring frost (32°F) is May 8 and the median first fall frost is Oct 17, for a typical growing season of 162 days. For a 90% chance that the last frost has passed, wait until May 22. Nearby ZIP codes are in USDA hardiness zone 6a.
- May 8Last spring frost (median)50% chance of 32°F after this date
- May 22Safer planting date10% chance of 32°F after this date
- Oct 17First fall frost (median)50% chance of 32°F by this date
- 162 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 | May 4 | May 20 | Jun 2 |
| 32°F | Apr 24 | May 8 | May 22 |
| 28°F | Apr 10 | Apr 27 | May 11 |
| 24°F | Mar 29 | Apr 13 | Apr 28 |
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 14 | Oct 1 | Oct 17 |
| 32°F | Sep 28 | Oct 17 | Nov 1 |
| 28°F | Oct 15 | Nov 1 | Nov 15 |
| 24°F | Nov 1 | Nov 13 | Nov 28 |
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 | 114 days | 134 days | 158 days |
| 32°F | 139 days | 162 days | 182 days |
| 28°F | 163 days | 187 days | 206 days |
| 24°F | 194 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 |
|---|---|---|---|
| 48445 | 6a | -10 to -5°F | 8 km |
| 48432 | 6a | -10 to -5°F | 9 km |
| 48731 | 6a | -10 to -5°F | 10 km |
| 48725 | 6a | -10 to -5°F | 11 km |
| 48755 | 6a | -10 to -5°F | 19 km |
| 48720 | 6a | -10 to -5°F | 27 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 USC00202804, at 43.9158, -83.0831, elevation 194 m (635 ft).
- Data quality: Representative (10+ years), 17 years of freeze data.
- Average days per year at or below 32°F: 150.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Bad Axe (14 km)
- Port Austin Wastewater Plant (17 km)
- Port Hope (26 km)
- Port Hope (30 km)
- Harbor Beach 1 SSE (36 km)
- Cass City 1 SSW (37 km)
- E Tawas (53 km)
- Caro Wastewater Plant (54 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.