Frost dates for Davenport WFO, IA
At Davenport WFO, the median last spring frost (32°F) is Apr 21 and the median first fall frost is Oct 17, for a typical growing season of 176 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 21Last spring frost (median)50% chance of 32°F after this date
- May 7Safer planting date10% chance of 32°F after this date
- Oct 17First fall frost (median)50% chance of 32°F by this date
- 176 daysGrowing season (median)between 32°F freezes
USDA hardiness zone 5b (-15 to -10°F) · see all zone 5b frost dates
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 16 | May 1 | May 15 |
| 32°F | Apr 7 | Apr 21 | May 7 |
| 28°F | Mar 30 | Apr 11 | Apr 27 |
| 24°F | Mar 15 | Apr 2 | Apr 16 |
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 7 | Oct 20 |
| 32°F | Oct 3 | Oct 17 | Oct 29 |
| 28°F | Oct 13 | Oct 26 | Nov 8 |
| 24°F | Oct 23 | Nov 5 | Nov 20 |
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 | 139 days | 158 days | 177 days |
| 32°F | 158 days | 176 days | 196 days |
| 28°F | 177 days | 197 days | 216 days |
| 24°F | 197 days | 219 days | 241 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 |
|---|---|---|---|
| 52807 | 5b | -15 to -10°F | 5 km |
| 52748 | 5b | -15 to -10°F | 6 km |
| 52756 | 5b | -15 to -10°F | 13 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 USC00132070, at 41.6119, -90.5803, elevation 229 m (750 ft).
- Data quality: Estimated from nearby stations (2+ years), 9 years of freeze data.
- Average days per year at or below 32°F: 138.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Davenport (0 km)
- Le Claire L&d 14 (16 km)
- Clinton #1 (33 km)
- Lowden (40 km)
- Muscatine 2N (42 km)
- Muscatine (47 km)
- Tipton (49 km)
- Maquoketa (52 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.