Frost dates for Rudyard 4n, MI
At Rudyard 4n, the median last spring frost (32°F) is May 24 and the median first fall frost is Oct 1, for a typical growing season of 127 days. For a 90% chance that the last frost has passed, wait until Jun 10. Nearby ZIP codes are in USDA hardiness zone 4b.
- May 24Last spring frost (median)50% chance of 32°F after this date
- Jun 10Safer planting date10% chance of 32°F after this date
- Oct 1First fall frost (median)50% chance of 32°F by this date
- 127 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 6 | Jun 30 |
| 32°F | May 8 | May 24 | Jun 10 |
| 28°F | Apr 26 | May 8 | May 26 |
| 24°F | Apr 13 | Apr 26 | May 11 |
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 1 | Sep 17 | Oct 2 |
| 32°F | Sep 14 | Oct 1 | Oct 14 |
| 28°F | Sep 27 | Oct 12 | Oct 29 |
| 24°F | Oct 9 | Oct 27 | Nov 10 |
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 | 71 days | 99 days | 121 days |
| 32°F | 104 days | 127 days | 149 days |
| 28°F | 131 days | 154 days | 176 days |
| 24°F | 160 days | 182 days | 204 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 |
|---|---|---|---|
| 49780 | 4b | -25 to -20°F | 13 km |
| 49715 | 4b | -25 to -20°F | 15 km |
| 49724 | 4b | -25 to -20°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 USC00207190, at 46.2964, -84.5761, elevation 230 m (753 ft).
- Data quality: Representative (10+ years), 13 years of freeze data.
- Average days per year at or below 32°F: 181.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Rudyard 5se (13 km)
- Pickford 3ne (23 km)
- Sault Ste Marie (25 km)
- Sault Ste Marie Sanderson Field (26 km)
- Trout Lake 1sw (37 km)
- Moran (39 km)
- Paradise (49 km)
- St. Ignace (50 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.