Frost dates for Cedar Rapids Muni Airport, IA
At Cedar Rapids Muni Airport, the median last spring frost (32°F) is Apr 27 and the median first fall frost is Oct 11, for a typical growing season of 165 days. For a 90% chance that the last frost has passed, wait until May 11. Nearby ZIP codes are in USDA hardiness zones 5a to 5b.
- Apr 27Last spring frost (median)50% chance of 32°F after this date
- May 11Safer planting date10% chance of 32°F after this date
- Oct 11First fall frost (median)50% chance of 32°F by this date
- 165 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 23 | May 6 | May 20 |
| 32°F | Apr 13 | Apr 27 | May 11 |
| 28°F | Apr 3 | Apr 16 | May 1 |
| 24°F | Mar 23 | Apr 6 | Apr 21 |
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 16 | Oct 1 | Oct 14 |
| 32°F | Sep 25 | Oct 11 | Oct 23 |
| 28°F | Oct 7 | Oct 21 | Nov 1 |
| 24°F | Oct 17 | Oct 29 | Nov 12 |
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 | 129 days | 147 days | 165 days |
| 32°F | 146 days | 165 days | 184 days |
| 28°F | 166 days | 186 days | 207 days |
| 24°F | 186 days | 206 days | 227 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 |
|---|---|---|---|
| 52404 | 5a | -20 to -15°F | 5 km |
| 52228 | 5a | -20 to -15°F | 6 km |
| 52338 | 5a | -20 to -15°F | 7 km |
| 52351 | 5a | -20 to -15°F | 10 km |
| 52405 | 5a | -20 to -15°F | 11 km |
| 52227 | 5a | -20 to -15°F | 12 km |
| 52317 | 5b | -15 to -10°F | 15 km |
| 52318 | 5a | -20 to -15°F | 15 km |
| 52203 | 5b | -15 to -10°F | 16 km |
| 52206 | 5a | -20 to -15°F | 19 km |
| 52354 | 5a | -20 to -15°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 USW00014990, at 41.8833, -91.7167, elevation 265 m (868 ft).
- Data quality: Standard (24+ years of data), 30 years of freeze data.
- Average days per year at or below 32°F: 144.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Cedar Rapids #1 (21 km)
- Iowa City Muni Airport (31 km)
- Williamsburg 1e (34 km)
- Iowa City (35 km)
- Vinton (40 km)
- Anamosa 3 SSW (40 km)
- Anamosa 1 WNW (43 km)
- Belle Plaine (46 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.