Frost dates for Farmington, MI
At Farmington, the median last spring frost (32°F) is May 1 and the median first fall frost is Oct 17, 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 zones 6a to 6b.
- May 1Last spring frost (median)50% chance of 32°F after this date
- May 16Safer planting date10% chance of 32°F after this date
- Oct 17First 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 30 | May 13 | May 27 |
| 32°F | Apr 19 | May 1 | May 16 |
| 28°F | Apr 8 | Apr 22 | May 5 |
| 24°F | Mar 28 | Apr 9 | Apr 23 |
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 23 | Oct 4 | Oct 17 |
| 32°F | Oct 1 | Oct 17 | Oct 29 |
| 28°F | Oct 15 | Oct 27 | Nov 8 |
| 24°F | Oct 28 | Nov 7 | 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 | 125 days | 144 days | 162 days |
| 32°F | 146 days | 165 days | 183 days |
| 28°F | 168 days | 187 days | 206 days |
| 24°F | 195 days | 211 days | 229 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 |
|---|---|---|---|
| 48336 | 6b | -5 to 0°F | 1 km |
| 48335 | 6a | -10 to -5°F | 4 km |
| 48334 | 6a | -10 to -5°F | 4 km |
| 48152 | 6b | -5 to 0°F | 5 km |
| 48331 | 6a | -10 to -5°F | 5 km |
| 48033 | 6b | -5 to 0°F | 6 km |
| 48034 | 6b | -5 to 0°F | 7 km |
| 48240 | 6b | -5 to 0°F | 7 km |
| 48154 | 6b | -5 to 0°F | 8 km |
| 48322 | 6a | -10 to -5°F | 8 km |
| 48375 | 6a | -10 to -5°F | 8 km |
| 48025 | 6b | -5 to 0°F | 10 km |
| 48377 | 6a | -10 to -5°F | 10 km |
| 48219 | 6b | -5 to 0°F | 10 km |
| 48150 | 6b | -5 to 0°F | 11 km |
| 48301 | 6a | -10 to -5°F | 11 km |
| 48075 | 6b | -5 to 0°F | 11 km |
| 48076 | 6b | -5 to 0°F | 11 km |
| 48374 | 6a | -10 to -5°F | 13 km |
| 48390 | 6a | -10 to -5°F | 13 km |
| 48167 | 6a | -10 to -5°F | 14 km |
| 48072 | 6b | -5 to 0°F | 15 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 USC00202691, at 42.4669, -83.3625, elevation 220 m (720 ft).
- Data quality: Representative (10+ years), 16 years of freeze data.
- Average days per year at or below 32°F: 146.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Dearborn (19 km)
- Dearborn #2 (20 km)
- Pontiac Wastewater Plant (21 km)
- Pontiac Oakland Co Intl Airport (22 km)
- Detroit Metro Airport (26 km)
- White Lake 4e (27 km)
- Milford Gm Proving Ground (29 km)
- Detroit Willow Run Airport (30 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.