Last spring frost
Mar 20
Frost Dates for Alpine, AR
First fall frost
Nov 10
Growing season
234 days
Hardiness zone
8a
In an average year around Alpine, AR, the last spring frost (32°F) is about Mar 20 and the first fall frost is about Nov 10, giving roughly a 234-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 21 | Apr 4 | Mar 15 |
| Freeze (32°F) | Apr 7 | Mar 20 | Feb 28 |
| Hard (28°F) | Mar 25 | Mar 4 | Feb 13 |
| Severe (24°F) | Mar 11 | Feb 20 | Jan 28 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 21 | Apr 16 | Apr 11 | Apr 7 | Apr 4 | Apr 1 | Mar 29 | Mar 24 | Mar 15 |
| 32°F | Apr 7 | Apr 3 | Mar 29 | Mar 25 | Mar 20 | Mar 16 | Mar 12 | Mar 6 | Feb 28 |
| 28°F | Mar 25 | Mar 18 | Mar 13 | Mar 8 | Mar 4 | Mar 1 | Feb 26 | Feb 21 | Feb 13 |
| 24°F | Mar 11 | Mar 5 | Mar 1 | Feb 25 | Feb 20 | Feb 15 | Feb 9 | Feb 2 | Jan 28 |
| 20°F | Mar 2 | Feb 22 | Feb 15 | Feb 8 | Feb 2 | Jan 30 | Jan 25 | Jan 17 | Jan 7 |
| 16°F | Feb 19 | Feb 10 | Feb 3 | Jan 29 | Jan 22 | Jan 17 | Jan 11 | Jan 4 | Dec 30 |
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 17 | Oct 30 | Nov 15 |
| Freeze (32°F) | Oct 27 | Nov 10 | Nov 28 |
| Hard (28°F) | Nov 4 | Nov 23 | Dec 11 |
| Severe (24°F) | Nov 15 | Dec 5 | Jan 1 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 17 | Oct 21 | Oct 25 | Oct 28 | Oct 30 | Nov 1 | Nov 4 | Nov 9 | Nov 15 |
| 32°F | Oct 27 | Nov 1 | Nov 4 | Nov 6 | Nov 10 | Nov 14 | Nov 17 | Nov 22 | Nov 28 |
| 28°F | Nov 4 | Nov 9 | Nov 14 | Nov 19 | Nov 23 | Nov 26 | Dec 1 | Dec 5 | Dec 11 |
| 24°F | Nov 15 | Nov 22 | Nov 27 | Dec 1 | Dec 5 | Dec 10 | Dec 16 | Dec 24 | Jan 1 |
| 20°F | Nov 29 | Dec 6 | Dec 14 | Dec 22 | Dec 28 | Jan 1 | Jan 5 | Jan 12 | Jan 25 |
| 16°F | Dec 11 | Dec 22 | Dec 29 | Jan 1 | Jan 5 | Jan 9 | Jan 15 | Jan 22 | Feb 4 |
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: Degray Lake Sp, Ar, about 14.7 miles away@if(!empty($station['elevation_ft'])), at 490 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 Alpine, AR?
On average, the last spring frost (32°F) around Alpine, AR is about Mar 20. 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 Alpine, AR typically arrives about Nov 10. 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 20 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 234 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 71921 Planting calendar → Arkansas frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026