Frost dates for Houghton Lake Roscommon Airport, MI
At Houghton Lake Roscommon Airport, the median last spring frost (32°F) is May 19 and the median first fall frost is Sep 23, for a typical growing season of 125 days. For a 90% chance that the last frost has passed, wait until Jun 3. Nearby ZIP codes are in USDA hardiness zone 5a.
- May 19Last spring frost (median)50% chance of 32°F after this date
- Jun 3Safer planting date10% chance of 32°F after this date
- Sep 23First fall frost (median)50% chance of 32°F by this date
- 125 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 20 | Jun 3 | Jun 30 |
| 32°F | Apr 30 | May 19 | Jun 3 |
| 28°F | Apr 17 | May 4 | May 24 |
| 24°F | Apr 6 | Apr 22 | May 9 |
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 | Aug 20 | Sep 8 | Sep 25 |
| 32°F | Sep 6 | Sep 23 | Oct 7 |
| 28°F | Sep 21 | Oct 5 | Oct 25 |
| 24°F | Oct 2 | Oct 24 | Nov 9 |
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 | 64 days | 95 days | 120 days |
| 32°F | 100 days | 125 days | 150 days |
| 28°F | 128 days | 154 days | 178 days |
| 24°F | 158 days | 184 days | 207 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 |
|---|---|---|---|
| 48651 | 5a | -20 to -15°F | 13 km |
| 48627 | 5a | -20 to -15°F | 13 km |
| 48653 | 5a | -20 to -15°F | 16 km |
| 48656 | 5a | -20 to -15°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 USW00094814, at 44.3592, -84.6739, elevation 351 m (1,151 ft).
- Data quality: Standard (24+ years of data), 30 years of freeze data.
- Average days per year at or below 32°F: 169.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Houghton Lake 2nw (10 km)
- Houghton Lake 6 WSW (18 km)
- Grayling (33 km)
- Kalkaska 11se (39 km)
- W Branch 3se (39 km)
- Lake City Exp. Farm (43 km)
- Gladwin (45 km)
- Lupton 1s (52 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.