Frost dates for Saginaw Mbs Intl Airport, MI
At Saginaw Mbs Intl Airport, the median last spring frost (32°F) is Apr 26 and the median first fall frost is Oct 17, for a typical growing season of 172 days. For a 90% chance that the last frost has passed, wait until May 13. Nearby ZIP codes are in USDA hardiness zone 6a.
- Apr 26Last spring frost (median)50% chance of 32°F after this date
- May 13Safer planting date10% chance of 32°F after this date
- Oct 17First 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 24 | May 7 | May 22 |
| 32°F | Apr 13 | Apr 26 | May 13 |
| 28°F | Apr 1 | Apr 15 | Apr 30 |
| 24°F | Mar 20 | Apr 4 | Apr 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 | Sep 23 | Oct 5 | Oct 18 |
| 32°F | Oct 2 | Oct 17 | Oct 31 |
| 28°F | Oct 15 | Oct 31 | Nov 13 |
| 24°F | Oct 29 | Nov 11 | Nov 26 |
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 | 130 days | 149 days | 170 days |
| 32°F | 151 days | 172 days | 193 days |
| 28°F | 173 days | 197 days | 217 days |
| 24°F | 202 days | 221 days | 242 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 |
|---|---|---|---|
| 48623 | 6a | -10 to -5°F | 5 km |
| 48710 | 6a | -10 to -5°F | 8 km |
| 48604 | 6a | -10 to -5°F | 10 km |
| 48626 | 6a | -10 to -5°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 USW00014845, at 43.5331, -84.0797, elevation 201 m (660 ft).
- Data quality: Standard (24+ years of data), 26 years of freeze data.
- Average days per year at or below 32°F: 139.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Auburn 2ne (11 km)
- Midland (13 km)
- Saginaw #3 (17 km)
- Essexville (21 km)
- Frankenmuth 1se (38 km)
- Oil City 2s (41 km)
- Vassar (44 km)
- Alma (49 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.