Frost dates for Clearwater Dam, MO
At Clearwater Dam, the median last spring frost (32°F) is Apr 9 and the median first fall frost is Oct 26, for a typical growing season of 199 days. For a 90% chance that the last frost has passed, wait until Apr 24. Nearby ZIP codes are in USDA hardiness zones 6b to 7a.
- Apr 9Last spring frost (median)50% chance of 32°F after this date
- Apr 24Safer planting date10% chance of 32°F after this date
- Oct 26First fall frost (median)50% chance of 32°F by this date
- 199 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 6 | Apr 21 | May 5 |
| 32°F | Mar 24 | Apr 9 | Apr 24 |
| 28°F | Mar 10 | Mar 28 | Apr 13 |
| 24°F | Feb 28 | Mar 15 | Mar 31 |
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 | Oct 5 | Oct 17 | Oct 27 |
| 32°F | Oct 12 | Oct 26 | Nov 7 |
| 28°F | Oct 23 | Nov 4 | Nov 21 |
| 24°F | Nov 1 | Nov 15 | Dec 4 |
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 | 158 days | 178 days | 197 days |
| 32°F | 179 days | 199 days | 221 days |
| 28°F | 199 days | 222 days | 245 days |
| 24°F | 220 days | 244 days | 269 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 |
|---|---|---|---|
| 63957 | 7a | 0 to 5°F | 7 km |
| 63952 | 7a | 0 to 5°F | 18 km |
| 63665 | 6b | -5 to 0°F | 19 km |
| 63937 | 7a | 0 to 5°F | 20 km |
| 63675 | 6b | -5 to 0°F | 22 km |
| 63638 | 6b | -5 to 0°F | 23 km |
| 63956 | 7a | 0 to 5°F | 24 km |
| 63636 | 6b | -5 to 0°F | 25 km |
| 63965 | 6b | -5 to 0°F | 29 km |
| 63620 | 6b | -5 to 0°F | 30 km |
| 63950 | 6b | -5 to 0°F | 35 km |
| 63964 | 6b | -5 to 0°F | 35 km |
| 63654 | 6b | -5 to 0°F | 40 km |
| 63633 | 6b | -5 to 0°F | 41 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 USC00231674, at 37.1319, -90.7756, elevation 201 m (660 ft).
- Data quality: Representative (10+ years), 24 years of freeze data.
- Average days per year at or below 32°F: 109.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Wappapello Dam (49 km)
- Eminence 1 N (52 km)
- Poplar Bluff (53 km)
- Poplar Bluff Muni Airport (57 km)
- Winona 3 SW (57 km)
- Doniphan (57 km)
- Round Spring 2sw (59 km)
- Fredericktown (64 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.