Frost dates for Harper 3ene, TX
At Harper 3ene, the median last spring frost (32°F) is Mar 15 and the median first fall frost is Nov 15, for a typical growing season of 243 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 15Last spring frost (median)50% chance of 32°F after this date
- Apr 12Safer planting date10% chance of 32°F after this date
- Nov 15First fall frost (median)50% chance of 32°F by this date
- 243 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 7 | Apr 1 | Apr 24 |
| 32°F | Feb 24 | Mar 15 | Apr 12 |
| 28°F | Feb 5 | Mar 2 | Mar 28 |
| 24°F | Jan 3 | Feb 16 | 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 20 | Nov 4 | Nov 24 |
| 32°F | Oct 27 | Nov 15 | Dec 6 |
| 28°F | Nov 4 | Nov 29 | Dec 25 |
| 24°F | Nov 14 | Dec 13 | Jan 18 |
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 | 191 days | 218 days | 248 days |
| 32°F | 211 days | 243 days | 273 days |
| 28°F | 234 days | 270 days | 308 days |
| 24°F | 264 days | 305 days | 351 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 96% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 78631 | 8a | 10 to 15°F | 11 km |
| 78618 | 8b | 15 to 20°F | 20 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 USC00413954, at 30.3086, -99.2030, elevation 643 m (2,110 ft).
- Data quality: Estimated from nearby stations (2+ years), 11 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
- Kerrville 3 NNE (28 km)
- Fredericksburg (29 km)
- Hunt 10 W (40 km)
- Mason (49 km)
- Medina 1ne (56 km)
- Junction Kimble Co Airport (59 km)
- Junction 4ssw (60 km)
- Llano (71 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.