Frost dates for Morrilton, AR
At Morrilton, the median last spring frost (32°F) is Mar 30 and the median first fall frost is Nov 2, for a typical growing season of 219 days. For a 90% chance that the last frost has passed, wait until Apr 15. Nearby ZIP codes are in USDA hardiness zones 7b to 8a.
- Mar 30Last spring frost (median)50% chance of 32°F after this date
- Apr 15Safer planting date10% chance of 32°F after this date
- Nov 2First fall frost (median)50% chance of 32°F by this date
- 219 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 28 | Apr 10 | Apr 27 |
| 32°F | Mar 11 | Mar 30 | Apr 15 |
| 28°F | Feb 26 | Mar 14 | Apr 2 |
| 24°F | Feb 7 | Mar 1 | Mar 19 |
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 11 | Oct 24 | Nov 6 |
| 32°F | Oct 19 | Nov 2 | Nov 20 |
| 28°F | Oct 30 | Nov 14 | Dec 2 |
| 24°F | Nov 8 | Nov 28 | Dec 19 |
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 | 175 days | 196 days | 217 days |
| 32°F | 195 days | 219 days | 245 days |
| 28°F | 217 days | 245 days | 270 days |
| 24°F | 245 days | 271 days | 299 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 |
|---|---|---|---|
| 72110 | 8a | 10 to 15°F | 1 km |
| 72125 | 8a | 10 to 15°F | 10 km |
| 72001 | 8a | 10 to 15°F | 15 km |
| 72823 | 8a | 10 to 15°F | 16 km |
| 72156 | 8a | 10 to 15°F | 16 km |
| 72070 | 8a | 10 to 15°F | 17 km |
| 72063 | 8a | 10 to 15°F | 18 km |
| 72030 | 7b | 5 to 10°F | 31 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 USC00034938, at 35.1581, -92.7672, elevation 104 m (340 ft).
- Data quality: Standard (24+ years of data), 27 years of freeze data.
- Average days per year at or below 32°F: 81.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Conway (26 km)
- Russellville Muni Airport (32 km)
- Dardanelle (37 km)
- Greenbrier (38 km)
- Alum Fk (41 km)
- Nimrod Dam (42 km)
- Marche (49 km)
- Little Rock (58 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.