Last spring frost
Mar 18
Frost Dates for Harrell, AR
First fall frost
Nov 7
Growing season
235 days
Hardiness zone
8a
In an average year around Harrell, AR, the last spring frost (32°F) is about Mar 18 and the first fall frost is about Nov 7, giving roughly a 235-day growing season. To be safe most years, wait until Feb 28 before setting out tender plants.
Last spring frost
Dates the last frost of spring typically ends. Plant tender crops after the risk has passed for your comfort level.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | Apr 20 | Apr 2 | Mar 14 |
| Freeze (32°F) | Apr 6 | Mar 18 | Feb 28 |
| Hard (28°F) | Mar 23 | Mar 4 | Feb 10 |
| Severe (24°F) | Mar 10 | Feb 17 | Jan 19 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 20 | Apr 13 | Apr 7 | Apr 5 | Apr 2 | Mar 30 | Mar 26 | Mar 20 | Mar 14 |
| 32°F | Apr 6 | Apr 1 | Mar 27 | Mar 22 | Mar 18 | Mar 15 | Mar 10 | Mar 6 | Feb 28 |
| 28°F | Mar 23 | Mar 16 | Mar 11 | Mar 8 | Mar 4 | Feb 28 | Feb 26 | Feb 21 | Feb 10 |
| 24°F | Mar 10 | Mar 4 | Feb 28 | Feb 23 | Feb 17 | Feb 12 | Feb 2 | Jan 29 | Jan 19 |
| 20°F | Feb 27 | Feb 15 | Feb 8 | Feb 2 | Jan 31 | Jan 25 | Jan 19 | Jan 10 | Dec 30 |
| 16°F | Feb 8 | Feb 1 | Jan 28 | Jan 23 | Jan 19 | Jan 11 | Jan 6 | Dec 31 | Dec 24 |
First fall frost
Dates the first frost of fall typically arrives. Count back by a crop's days-to-maturity to know your planting cutoff.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | Oct 16 | Oct 30 | Nov 13 |
| Freeze (32°F) | Oct 24 | Nov 7 | Nov 27 |
| Hard (28°F) | Nov 3 | Nov 21 | Dec 11 |
| Severe (24°F) | Nov 12 | Dec 5 | Jan 5 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 16 | Oct 20 | Oct 23 | Oct 26 | Oct 30 | Nov 1 | Nov 4 | Nov 7 | Nov 13 |
| 32°F | Oct 24 | Oct 30 | Nov 2 | Nov 5 | Nov 7 | Nov 11 | Nov 15 | Nov 19 | Nov 27 |
| 28°F | Nov 3 | Nov 7 | Nov 12 | Nov 16 | Nov 21 | Nov 26 | Dec 1 | Dec 4 | Dec 11 |
| 24°F | Nov 12 | Nov 19 | Nov 26 | Dec 1 | Dec 5 | Dec 10 | Dec 19 | Dec 28 | Jan 5 |
| 20°F | Nov 27 | Dec 6 | Dec 14 | Dec 21 | Dec 27 | Jan 1 | Jan 6 | Jan 14 | Jan 25 |
| 16°F | Dec 12 | Dec 22 | Dec 27 | Jan 1 | Jan 4 | Jan 8 | Jan 15 | Jan 20 | Feb 1 |
Growing season is measured at 32°F with about 50% probability. Hardiness zone from the 2023 USDA map; frost normals from NOAA 1991-2020.
Where this data comes from
@endif These dates are computed from the nearest official weather station with long-term records: Calion L&D, Ar, about 14.3 miles away@if(!empty($station['elevation_ft'])), at 77 ft elevation. The further the station and the greater the elevation difference from your yard, the more your local frost timing can vary.
How we calculate these dates
Frost and freeze dates come from the NOAA 1991–2020 U.S. Climate Normals, the National Oceanic and Atmospheric Administration's 30-year averages for each weather station. A date shown at the 50% level is the median: in half of years the frost falls on or before it. The 10% and 90% columns show the early and late ends of the range, so you can plant on the odds you're comfortable with. These are long-term averages, not a forecast for this year - always check your local outlook before planting.
Source: NOAA National Centers for Environmental Information, 1991–2020 Climate Normals (public domain). Harman is not affiliated with or endorsed by NOAA.
Frequently asked questions
When is the last frost in Harrell, AR?
On average, the last spring frost (32°F) around Harrell, AR is about Mar 18. In cooler years it can run later, so for a safer bet many gardeners wait until Feb 28.
When is the first frost in the fall?
The first fall frost around Harrell, AR typically arrives about Nov 7. Count back by a crop's days to maturity to find the latest date you can plant it.
When can I plant tomatoes and other tender crops?
Tender crops like tomatoes, peppers and basil are damaged by frost, so wait until the last spring frost has passed - around Mar 18 on average, or Feb 28 to be safe most years.
How long is the growing season here?
The frost-free growing season (between the last spring and first fall 32°F frost) is about 235 days in a typical year.
Are these dates a forecast for this year?
No. They are 30-year averages from the NOAA 1991–2020 Climate Normals, not a prediction for the current year. Use them for planning and always check your local weather forecast before planting or protecting crops.
Local weather for 71745 Planting calendar → Arkansas frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026