Frost dates for Pontiac Oakland Co Intl Airport, MI
At Pontiac Oakland Co Intl Airport, the median last spring frost (32°F) is Apr 29 and the median first fall frost is Oct 20, for a typical growing season of 172 days. For a 90% chance that the last frost has passed, wait until May 14. Nearby ZIP codes are in USDA hardiness zone 6a.
- Apr 29Last spring frost (median)50% chance of 32°F after this date
- May 14Safer planting date10% chance of 32°F after this date
- Oct 20First fall frost (median)50% chance of 32°F by this date
- 172 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 27 | May 9 | May 23 |
| 32°F | Apr 16 | Apr 29 | May 14 |
| 28°F | Apr 4 | Apr 18 | May 1 |
| 24°F | Mar 23 | Apr 6 | Apr 19 |
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 26 | Oct 7 | Oct 21 |
| 32°F | Oct 5 | Oct 20 | Nov 2 |
| 28°F | Oct 19 | Nov 1 | Nov 14 |
| 24°F | Nov 1 | Nov 12 | 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 | 131 days | 151 days | 170 days |
| 32°F | 153 days | 172 days | 192 days |
| 28°F | 177 days | 197 days | 215 days |
| 24°F | 201 days | 220 days | 241 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 |
|---|---|---|---|
| 48327 | 6a | -10 to -5°F | 3 km |
| 48329 | 6a | -10 to -5°F | 3 km |
| 48328 | 6a | -10 to -5°F | 5 km |
| 48324 | 6a | -10 to -5°F | 8 km |
| 48323 | 6a | -10 to -5°F | 11 km |
| 48382 | 6a | -10 to -5°F | 12 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 USW00094817, at 42.6650, -83.4181, elevation 298 m (976 ft).
- Data quality: Representative (10+ years), 21 years of freeze data.
- Average days per year at or below 32°F: 136.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- White Lake 4e (6 km)
- Pontiac Wastewater Plant (14 km)
- Farmington (22 km)
- Milford Gm Proving Ground (24 km)
- Goodrich (29 km)
- Linden Wastewater Plant (36 km)
- Whitmore Lake 1nw (39 km)
- Dearborn #2 (41 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.