Frost dates for Mount Vernon, TX
At Mount Vernon, the median last spring frost (32°F) is Mar 15 and the median first fall frost is Nov 16, for a typical growing season of 245 days. For a 90% chance that the last frost has passed, wait until Apr 6. Nearby ZIP codes are in USDA hardiness zone 8b.
- Mar 15Last spring frost (median)50% chance of 32°F after this date
- Apr 6Safer planting date10% chance of 32°F after this date
- Nov 16First fall frost (median)50% chance of 32°F by this date
- 245 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 | Mar 8 | Mar 31 | Apr 19 |
| 32°F | Feb 23 | Mar 15 | Apr 6 |
| 28°F | Feb 4 | Mar 2 | Mar 25 |
| 24°F | Jan 13 | Feb 14 | Mar 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 | Oct 21 | Nov 4 | Nov 22 |
| 32°F | Oct 31 | Nov 16 | Dec 4 |
| 28°F | Nov 8 | Dec 1 | Dec 21 |
| 24°F | Nov 23 | Dec 15 | Jan 14 |
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 | 195 days | 220 days | 247 days |
| 32°F | 217 days | 245 days | 272 days |
| 28°F | 242 days | 273 days | 303 days |
| 24°F | 270 days | 306 days | 341 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 98% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 75457 | 8b | 15 to 20°F | 3 km |
| 75478 | 8b | 15 to 20°F | 12 km |
| 75487 | 8b | 15 to 20°F | 17 km |
| 75481 | 8b | 15 to 20°F | 20 km |
| 75480 | 8b | 15 to 20°F | 20 km |
| 75471 | 8b | 15 to 20°F | 21 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 USC00416119, at 33.1964, -95.2236, elevation 136 m (447 ft).
- Data quality: Representative (10+ years), 25 years of freeze data.
- Average days per year at or below 32°F: 41.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Mount Pleasant (21 km)
- Cooper Dam (38 km)
- Sulphur Springs (38 km)
- Clarksville 2ne (49 km)
- Lake Fk Rsvr (50 km)
- Gilmer 4 WNW (53 km)
- Daingerfield 9 S (56 km)
- Paris (62 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.