Frost dates for Oregon, MO
At Oregon, the median last spring frost (32°F) is Apr 16 and the median first fall frost is Oct 20, for a typical growing season of 186 days. For a 90% chance that the last frost has passed, wait until Apr 30. Nearby ZIP codes are in USDA hardiness zone 6a.
- Apr 16Last spring frost (median)50% chance of 32°F after this date
- Apr 30Safer planting date10% chance of 32°F after this date
- Oct 20First fall frost (median)50% chance of 32°F by this date
- 186 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 10 | Apr 26 | May 7 |
| 32°F | Apr 2 | Apr 16 | Apr 30 |
| 28°F | Mar 23 | Apr 6 | Apr 21 |
| 24°F | Mar 11 | Mar 29 | Apr 12 |
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 25 | Oct 10 | Oct 22 |
| 32°F | Oct 3 | Oct 20 | Nov 1 |
| 28°F | Oct 14 | Oct 30 | Nov 12 |
| 24°F | Oct 22 | Nov 6 | Nov 24 |
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 | 148 days | 168 days | 185 days |
| 32°F | 166 days | 186 days | 205 days |
| 28°F | 184 days | 205 days | 226 days |
| 24°F | 199 days | 223 days | 246 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 |
|---|---|---|---|
| 64451 | 6a | -10 to -5°F | 6 km |
| 64473 | 6a | -10 to -5°F | 6 km |
| 64449 | 6a | -10 to -5°F | 16 km |
| 66094 | 6a | -10 to -5°F | 17 km |
| 64466 | 6a | -10 to -5°F | 21 km |
| 64470 | 6a | -10 to -5°F | 22 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 USC00236357, at 39.9808, -95.1464, elevation 322 m (1,058 ft).
- Data quality: Standard (24+ years of data), 26 years of freeze data.
- Average days per year at or below 32°F: 122.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- St. Joseph Rosecrans Airport (30 km)
- Cosby 2w (40 km)
- Maryville 2e (48 km)
- Conception (49 km)
- Tarkio (54 km)
- Amity 4 NE (68 km)
- Albany (75 km)
- Grant City 5wsw (77 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.