Frost dates for Greenland 6n, MI
At Greenland 6n, the median last spring frost (32°F) is May 23 and the median first fall frost is Oct 1, for a typical growing season of 128 days. For a 90% chance that the last frost has passed, wait until Jun 8. Nearby ZIP codes are in USDA hardiness zones 4b to 5a.
- May 23Last spring frost (median)50% chance of 32°F after this date
- Jun 8Safer planting date10% chance of 32°F after this date
- Oct 1First fall frost (median)50% chance of 32°F by this date
- 128 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 24 | Jun 7 | Jun 29 |
| 32°F | May 6 | May 23 | Jun 8 |
| 28°F | Apr 24 | May 6 | May 24 |
| 24°F | Apr 12 | Apr 25 | May 8 |
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 29 | Sep 16 | Oct 2 |
| 32°F | Sep 14 | Oct 1 | Oct 16 |
| 28°F | Sep 26 | Oct 14 | Oct 31 |
| 24°F | Oct 15 | Oct 31 | Nov 13 |
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 | 70 days | 98 days | 121 days |
| 32°F | 105 days | 128 days | 150 days |
| 28°F | 135 days | 158 days | 180 days |
| 24°F | 165 days | 187 days | 206 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 |
|---|---|---|---|
| 49929 | 5a | -20 to -15°F | 8 km |
| 49948 | 4b | -25 to -20°F | 16 km |
| 49965 | 5a | -20 to -15°F | 20 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 USC00203421, at 46.8736, -89.1006, elevation 241 m (791 ft).
- Data quality: Representative (10+ years), 10 years of freeze data.
- Average days per year at or below 32°F: 186.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Ontonagon 6 SE (9 km)
- Baraga 7nw (38 km)
- Bergland Dam (47 km)
- Watton 2wsw (52 km)
- Jacobsville (53 km)
- Paulding (53 km)
- Alberta Ford For Center (54 km)
- Covington 1nnw (55 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.