Frost dates for Blakely Mountain Dam, AR
At Blakely Mountain Dam, the median last spring frost (32°F) is Apr 3 and the median first fall frost is Nov 4, for a typical growing season of 216 days. For a 90% chance that the last frost has passed, wait until Apr 20. Nearby ZIP codes are in USDA hardiness zones 7b to 8a.
- Apr 3Last spring frost (median)50% chance of 32°F after this date
- Apr 20Safer planting date10% chance of 32°F after this date
- Nov 4First fall frost (median)50% chance of 32°F by this date
- 216 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 31 | Apr 16 | Apr 30 |
| 32°F | Mar 14 | Apr 3 | Apr 20 |
| 28°F | Feb 27 | Mar 18 | Apr 5 |
| 24°F | Feb 7 | Mar 2 | Mar 21 |
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 13 | Oct 26 | Nov 7 |
| 32°F | Oct 21 | Nov 4 | Nov 21 |
| 28°F | Nov 1 | Nov 16 | Dec 4 |
| 24°F | Nov 10 | Nov 30 | Dec 24 |
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 | 172 days | 193 days | 213 days |
| 32°F | 193 days | 216 days | 239 days |
| 28°F | 216 days | 243 days | 269 days |
| 24°F | 246 days | 272 days | 301 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 |
|---|---|---|---|
| 71956 | 8a | 10 to 15°F | 7 km |
| 71968 | 8a | 10 to 15°F | 10 km |
| 71949 | 7b | 5 to 10°F | 13 km |
| 71964 | 8a | 10 to 15°F | 17 km |
| 71933 | 8a | 10 to 15°F | 23 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 USC00030764, at 34.5697, -93.1947, elevation 130 m (426 ft).
- Data quality: Representative (10+ years), 24 years of freeze data.
- Average days per year at or below 32°F: 80.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Hot Springs 1 NNE (15 km)
- Hot Springs Asos (33 km)
- Mount Ida Asos (35 km)
- Degray Lake State Park (35 km)
- Mount Ida 3 SE (36 km)
- Malvern (38 km)
- Alum Fk (41 km)
- Nimrod Dam (43 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.