Last spring frost
Mar 21
Frost Dates for Allport, AR
First fall frost
Nov 9
Growing season
235 days
Hardiness zone
8b
In an average year around Allport, AR, the last spring frost (32°F) is about Mar 21 and the first fall frost is about Nov 9, giving roughly a 235-day growing season. To be safe most years, wait until Mar 2 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 18 | Apr 2 | Mar 16 |
| Freeze (32°F) | Apr 6 | Mar 21 | Mar 2 |
| Hard (28°F) | Mar 26 | Mar 8 | Feb 18 |
| Severe (24°F) | Mar 16 | Feb 26 | Jan 31 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 18 | Apr 11 | Apr 8 | Apr 5 | Apr 2 | Mar 31 | Mar 27 | Mar 23 | Mar 16 |
| 32°F | Apr 6 | Apr 1 | Mar 28 | Mar 24 | Mar 21 | Mar 18 | Mar 13 | Mar 9 | Mar 2 |
| 28°F | Mar 26 | Mar 20 | Mar 16 | Mar 12 | Mar 8 | Mar 4 | Mar 1 | Feb 26 | Feb 18 |
| 24°F | Mar 16 | Mar 9 | Mar 4 | Mar 1 | Feb 26 | Feb 21 | Feb 15 | Feb 8 | Jan 31 |
| 20°F | Mar 6 | Feb 27 | Feb 21 | Feb 15 | Feb 7 | Feb 1 | Jan 28 | Jan 21 | Jan 9 |
| 16°F | Feb 25 | Feb 14 | Feb 4 | Jan 30 | Jan 26 | Jan 20 | Jan 15 | Jan 7 | Jan 1 |
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 18 | Oct 30 | Nov 12 |
| Freeze (32°F) | Oct 27 | Nov 9 | Nov 26 |
| Hard (28°F) | Nov 4 | Nov 22 | Dec 12 |
| Severe (24°F) | Nov 15 | Dec 8 | Jan 4 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 18 | Oct 22 | Oct 25 | Oct 27 | Oct 30 | Nov 1 | Nov 4 | Nov 7 | Nov 12 |
| 32°F | Oct 27 | Nov 1 | Nov 3 | Nov 6 | Nov 9 | Nov 12 | Nov 16 | Nov 21 | Nov 26 |
| 28°F | Nov 4 | Nov 9 | Nov 14 | Nov 18 | Nov 22 | Nov 26 | Dec 1 | Dec 5 | Dec 12 |
| 24°F | Nov 15 | Nov 23 | Nov 28 | Dec 3 | Dec 8 | Dec 14 | Dec 20 | Dec 27 | Jan 4 |
| 20°F | Dec 2 | Dec 12 | Dec 20 | Dec 25 | Dec 30 | Jan 3 | Jan 8 | Jan 15 | Jan 28 |
| 16°F | Dec 15 | Dec 24 | Dec 30 | Jan 2 | Jan 7 | Jan 12 | Jan 16 | Jan 23 | Feb 5 |
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: Keo, Ar, about 14.3 miles away@if(!empty($station['elevation_ft'])), at 231 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 Allport, AR?
On average, the last spring frost (32°F) around Allport, AR is about Mar 21. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 2.
When is the first frost in the fall?
The first fall frost around Allport, AR typically arrives about Nov 9. 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 21 on average, or Mar 2 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 72072 Planting calendar → Arkansas frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026