Frost dates for Smithville Lake, MO
At Smithville Lake, the median last spring frost (32°F) is Apr 18 and the median first fall frost is Oct 20, for a typical growing season of 183 days. For a 90% chance that the last frost has passed, wait until May 3. Nearby ZIP codes are in USDA hardiness zones 6a to 6b.
- Apr 18Last spring frost (median)50% chance of 32°F after this date
- May 3Safer planting date10% chance of 32°F after this date
- Oct 20First fall frost (median)50% chance of 32°F by this date
- 183 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 14 | Apr 28 | May 13 |
| 32°F | Apr 4 | Apr 18 | May 3 |
| 28°F | Mar 23 | Apr 7 | Apr 23 |
| 24°F | Mar 9 | Mar 29 | Apr 14 |
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 23 |
| 32°F | Oct 5 | Oct 20 | Nov 1 |
| 28°F | Oct 15 | Oct 29 | Nov 11 |
| 24°F | Oct 22 | Nov 5 | Nov 23 |
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 | 143 days | 164 days | 183 days |
| 32°F | 163 days | 183 days | 202 days |
| 28°F | 182 days | 204 days | 225 days |
| 24°F | 200 days | 223 days | 248 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 |
|---|---|---|---|
| 64089 | 6a | -10 to -5°F | 1 km |
| 64166 | 6a | -10 to -5°F | 8 km |
| 64165 | 6a | -10 to -5°F | 8 km |
| 64164 | 6b | -5 to 0°F | 9 km |
| 64167 | 6a | -10 to -5°F | 10 km |
| 64492 | 6a | -10 to -5°F | 10 km |
| 64155 | 6b | -5 to 0°F | 12 km |
| 64156 | 6a | -10 to -5°F | 13 km |
| 64444 | 6a | -10 to -5°F | 14 km |
| 64157 | 6a | -10 to -5°F | 14 km |
| 64018 | 6a | -10 to -5°F | 16 km |
| 64477 | 6a | -10 to -5°F | 22 km |
| 64439 | 6a | -10 to -5°F | 23 km |
| 64454 | 6a | -10 to -5°F | 24 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 USC00237862, at 39.3903, -94.5497, elevation 276 m (904 ft).
- Data quality: Representative (10+ years), 28 years of freeze data.
- Average days per year at or below 32°F: 119.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Kansas City Intl Airport (19 km)
- Kearney 3e (19 km)
- Kansas City Downtown Airport (30 km)
- Independence (39 km)
- Cameron (47 km)
- Lees Summit Muni Airport (50 km)
- Richmond 3s (53 km)
- Cosby 2w (53 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.