Frost dates for Brunswick, MO
At Brunswick, the median last spring frost (32°F) is Apr 10 and the median first fall frost is Oct 29, for a typical growing season of 201 days. For a 90% chance that the last frost has passed, wait until Apr 26. Nearby ZIP codes are in USDA hardiness zones 6a to 6b.
- Apr 10Last spring frost (median)50% chance of 32°F after this date
- Apr 26Safer planting date10% chance of 32°F after this date
- Oct 29First fall frost (median)50% chance of 32°F by this date
- 201 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 7 |
| 32°F | Mar 24 | Apr 10 | Apr 26 |
| 28°F | Mar 12 | Mar 31 | Apr 16 |
| 24°F | Mar 2 | Mar 18 | Apr 5 |
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 3 | Oct 19 | Oct 31 |
| 32°F | Oct 15 | Oct 29 | Nov 11 |
| 28°F | Oct 26 | Nov 7 | Nov 24 |
| 24°F | Nov 3 | Nov 17 | 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 | 179 days | 197 days |
| 32°F | 179 days | 201 days | 223 days |
| 28°F | 202 days | 223 days | 246 days |
| 24°F | 219 days | 243 days | 267 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 |
|---|---|---|---|
| 65236 | 6a | -10 to -5°F | 5 km |
| 64639 | 6a | -10 to -5°F | 8 km |
| 65286 | 6a | -10 to -5°F | 12 km |
| 65344 | 6b | -5 to 0°F | 13 km |
| 65246 | 6a | -10 to -5°F | 13 km |
| 64660 | 6a | -10 to -5°F | 17 km |
| 64623 | 6a | -10 to -5°F | 18 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 USC00231037, at 39.4247, -93.1331, elevation 202 m (662 ft).
- Data quality: Representative (10+ years), 21 years of freeze data.
- Average days per year at or below 32°F: 118.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Salisbury (28 km)
- Carrollton (31 km)
- Marshall (33 km)
- Brookfield (38 km)
- Waverly (42 km)
- Linneus 3se (48 km)
- Chillicothe 22 ENE (49 km)
- Chillicothe 2s (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.