Frost dates for Smithville, OK
At Smithville, the median last spring frost (32°F) is Apr 9 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 24. Nearby ZIP codes are in USDA hardiness zone 7b.
- 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 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 20 | May 2 |
| 32°F | Mar 23 | Apr 9 | Apr 24 |
| 28°F | Mar 6 | Mar 28 | Apr 14 |
| 24°F | Feb 25 | Mar 10 | Apr 2 |
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 4 | Oct 19 | Nov 1 |
| 32°F | Oct 14 | Oct 29 | Nov 11 |
| 28°F | Oct 21 | Nov 5 | Nov 23 |
| 24°F | Nov 1 | 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 | 161 days | 182 days | 202 days |
| 32°F | 180 days | 201 days | 225 days |
| 28°F | 199 days | 223 days | 250 days |
| 24°F | 223 days | 249 days | 274 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 |
|---|---|---|---|
| 74957 | 7b | 5 to 10°F | 6 km |
| 74963 | 7b | 5 to 10°F | 10 km |
| 74949 | 7b | 5 to 10°F | 27 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 USC00348285, at 34.4678, -94.6428, elevation 250 m (822 ft).
- Data quality: Representative (10+ years), 14 years of freeze data.
- Average days per year at or below 32°F: 88.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Battiest (25 km)
- Broken Bow 1 N (47 km)
- Wister 3s (53 km)
- Tuskahoma (61 km)
- Idabel (62 km)
- Wilburton 9 ENE (73 km)
- Mc Curtain 1 SE (81 km)
- Antlers (93 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.