Frost dates for Guthrie Center, IA
At Guthrie Center, the median last spring frost (32°F) is May 2 and the median first fall frost is Oct 3, for a typical growing season of 153 days. For a 90% chance that the last frost has passed, wait until May 17. Nearby ZIP codes are in USDA hardiness zones 5a to 5b.
- May 2Last spring frost (median)50% chance of 32°F after this date
- May 17Safer planting date10% chance of 32°F after this date
- Oct 3First fall frost (median)50% chance of 32°F by this date
- 153 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 30 | May 12 | May 26 |
| 32°F | Apr 18 | May 2 | May 17 |
| 28°F | Apr 8 | Apr 23 | May 8 |
| 24°F | Mar 28 | Apr 11 | Apr 27 |
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 12 | Sep 25 | Oct 7 |
| 32°F | Sep 20 | Oct 3 | Oct 18 |
| 28°F | Sep 30 | Oct 15 | Oct 28 |
| 24°F | Oct 11 | Oct 25 | 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 | 118 days | 134 days | 152 days |
| 32°F | 133 days | 153 days | 172 days |
| 28°F | 152 days | 173 days | 194 days |
| 24°F | 175 days | 195 days | 215 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 |
|---|---|---|---|
| 50115 | 5a | -20 to -15°F | 6 km |
| 50216 | 5a | -20 to -15°F | 12 km |
| 50048 | 5b | -15 to -10°F | 17 km |
| 50277 | 5a | -20 to -15°F | 18 km |
| 50029 | 5a | -20 to -15°F | 18 km |
| 50164 | 5b | -15 to -10°F | 19 km |
| 50146 | 5a | -20 to -15°F | 21 km |
| 50002 | 5b | -15 to -10°F | 21 km |
| 50233 | 5a | -20 to -15°F | 25 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 USC00133509, at 41.6686, -94.4972, elevation 325 m (1,065 ft).
- Data quality: Standard (24+ years of data), 30 years of freeze data.
- Average days per year at or below 32°F: 156.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Audubon (36 km)
- Perry (37 km)
- Jefferson (39 km)
- Greenfield (42 km)
- Atlantic 1 NE (51 km)
- Carroll (53 km)
- Winterset 1s (56 km)
- Des Moines Wsfo-Johnston (65 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.