Frost dates for Bergland Dam, MI
At Bergland Dam, the median last spring frost (32°F) is May 26 and the median first fall frost is Sep 27, for a typical growing season of 123 days. For a 90% chance that the last frost has passed, wait until Jun 8. Nearby ZIP codes are in USDA hardiness zones 4a to 4b.
- May 26Last spring frost (median)50% chance of 32°F after this date
- Jun 8Safer planting date10% chance of 32°F after this date
- Sep 27First fall frost (median)50% chance of 32°F by this date
- 123 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 23 | Jun 4 | Jun 18 |
| 32°F | May 9 | May 26 | Jun 8 |
| 28°F | Apr 28 | May 12 | May 28 |
| 24°F | Apr 16 | May 1 | May 17 |
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 28 | Sep 14 | Sep 30 |
| 32°F | Sep 10 | Sep 27 | Oct 9 |
| 28°F | Sep 22 | Oct 7 | Oct 23 |
| 24°F | Oct 3 | Oct 21 | Nov 6 |
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 | 75 days | 99 days | 121 days |
| 32°F | 103 days | 123 days | 142 days |
| 28°F | 125 days | 146 days | 167 days |
| 24°F | 148 days | 171 days | 192 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 |
|---|---|---|---|
| 49910 | 4b | -25 to -20°F | 5 km |
| 49925 | 4b | -25 to -20°F | 14 km |
| 49971 | 4b | -25 to -20°F | 15 km |
| 49947 | 4a | -30 to -25°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 USC00200718, at 46.5869, -89.5475, elevation 396 m (1,300 ft).
- Data quality: Standard (24+ years of data), 29 years of freeze data.
- Average days per year at or below 32°F: 202.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Paulding (35 km)
- Ontonagon 6 SE (38 km)
- Greenland 6n (47 km)
- Ironwood #2 (47 km)
- Ironwood (51 km)
- Watton 2wsw (70 km)
- Baraga 7nw (76 km)
- Covington 1nnw (77 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.