Frost dates for Clarinda, IA
At Clarinda, the median last spring frost (32°F) is Apr 25 and the median first fall frost is Oct 11, for a typical growing season of 168 days. For a 90% chance that the last frost has passed, wait until May 7. Nearby ZIP codes are in USDA hardiness zone 5b.
- Apr 25Last spring frost (median)50% chance of 32°F after this date
- May 7Safer planting date10% chance of 32°F after this date
- Oct 11First fall frost (median)50% chance of 32°F by this date
- 168 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 22 | May 4 | May 18 |
| 32°F | Apr 11 | Apr 25 | May 7 |
| 28°F | Apr 1 | Apr 14 | Apr 29 |
| 24°F | Mar 18 | Apr 4 | Apr 20 |
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 17 | Oct 1 | Oct 15 |
| 32°F | Sep 26 | Oct 11 | Oct 24 |
| 28°F | Oct 6 | Oct 21 | Nov 2 |
| 24°F | Oct 18 | 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 | 131 days | 150 days | 168 days |
| 32°F | 148 days | 168 days | 189 days |
| 28°F | 168 days | 189 days | 208 days |
| 24°F | 188 days | 208 days | 230 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 |
|---|---|---|---|
| 51632 | 5b | -15 to -10°F | 3 km |
| 51651 | 5b | -15 to -10°F | 8 km |
| 51656 | 5b | -15 to -10°F | 11 km |
| 51646 | 5b | -15 to -10°F | 12 km |
| 51637 | 5b | -15 to -10°F | 14 km |
| 51631 | 5b | -15 to -10°F | 15 km |
| 51630 | 5b | -15 to -10°F | 20 km |
| 64431 | 5b | -15 to -10°F | 22 km |
| 64445 | 5b | -15 to -10°F | 23 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 USC00131533, at 40.7244, -95.0192, elevation 299 m (980 ft).
- Data quality: Standard (24+ years of data), 25 years of freeze data.
- Average days per year at or below 32°F: 149.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Bedford (25 km)
- Shenandoah (29 km)
- Red Oak (36 km)
- Corning (37 km)
- Sidney 1sse (53 km)
- Creston 2 SW (63 km)
- Mount Ayr (65 km)
- Glenwood 3sw (71 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.