Frost dates for Ozona, TX
At Ozona, the median last spring frost (32°F) is Mar 21 and the median first fall frost is Nov 6, for a typical growing season of 227 days. For a 90% chance that the last frost has passed, wait until Apr 12. Nearby ZIP codes are in USDA hardiness zones 8a to 8b.
- Mar 21Last spring frost (median)50% chance of 32°F after this date
- Apr 12Safer planting date10% chance of 32°F after this date
- Nov 6First fall frost (median)50% chance of 32°F by this date
- 227 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 18 | Apr 7 | Apr 25 |
| 32°F | Mar 3 | Mar 21 | Apr 12 |
| 28°F | Feb 20 | Mar 8 | Mar 29 |
| 24°F | Feb 3 | Feb 26 | Mar 15 |
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 17 | Oct 31 | Nov 11 |
| 32°F | Oct 24 | Nov 6 | Nov 21 |
| 28°F | Nov 1 | Nov 16 | Dec 2 |
| 24°F | Nov 10 | Nov 27 | Dec 17 |
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 | 181 days | 204 days | 226 days |
| 32°F | 202 days | 227 days | 250 days |
| 28°F | 228 days | 251 days | 275 days |
| 24°F | 250 days | 275 days | 306 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
Closest ZIP codes (each is closer to another station)
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 76943 | 8a | 10 to 15°F | 30 km |
| 76930 | 8a | 10 to 15°F | 45 km |
| 79781 | 8b | 15 to 20°F | 55 km |
| 76936 | 8a | 10 to 15°F | 56 km |
| 76932 | 8a | 10 to 15°F | 63 km |
| 76941 | 8a | 10 to 15°F | 67 km |
| 76950 | 8a | 10 to 15°F | 69 km |
| 79744 | 8b | 15 to 20°F | 70 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 USC00416734, at 30.7169, -101.2061, elevation 715 m (2,345 ft).
- Data quality: Representative (10+ years), 15 years of freeze data.
- Average days per year at or below 32°F: 67.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Ozona 22se (36 km)
- Acton Rch (41 km)
- Sonora (55 km)
- Pandale 11 NE (55 km)
- Big Lake 2 (59 km)
- Sheffield (59 km)
- Eldorado (60 km)
- Pandale 1 N (66 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.