Last spring frost
Apr 29
Frost Dates for Hollis, AK
First fall frost
Oct 16
Growing season
169 days
In an average year around Hollis, AK, the last spring frost (32°F) is about Apr 29 and the first fall frost is about Oct 16, giving roughly a 169-day growing season. To be safe most years, wait until Apr 13 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) | Jun 3 | May 19 | May 4 |
| Freeze (32°F) | May 14 | Apr 29 | Apr 13 |
| Hard (28°F) | Apr 28 | Apr 9 | Mar 20 |
| Severe (24°F) | Apr 7 | Mar 16 | Feb 19 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Jun 3 | May 29 | May 25 | May 21 | May 19 | May 15 | May 12 | May 8 | May 4 |
| 32°F | May 14 | May 9 | May 5 | May 2 | Apr 29 | Apr 27 | Apr 24 | Apr 20 | Apr 13 |
| 28°F | Apr 28 | Apr 22 | Apr 17 | Apr 13 | Apr 9 | Apr 5 | Apr 1 | Mar 28 | Mar 20 |
| 24°F | Apr 7 | Mar 31 | Mar 27 | Mar 22 | Mar 16 | Mar 12 | Mar 7 | Feb 28 | Feb 19 |
| 20°F | Mar 23 | Mar 12 | Mar 5 | Feb 28 | Feb 23 | Feb 15 | Feb 6 | Jan 27 | Jan 10 |
| 16°F | Mar 7 | Feb 28 | Feb 21 | Feb 11 | Feb 3 | Jan 28 | Jan 17 | Jan 4 | Dec 18 |
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) | Sep 19 | Oct 1 | Oct 17 |
| Freeze (32°F) | Oct 1 | Oct 16 | Nov 5 |
| Hard (28°F) | Oct 14 | Nov 5 | Nov 28 |
| Severe (24°F) | Nov 2 | Nov 26 | Dec 23 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 19 | Sep 22 | Sep 26 | Sep 29 | Oct 1 | Oct 4 | Oct 7 | Oct 11 | Oct 17 |
| 32°F | Oct 1 | Oct 6 | Oct 10 | Oct 13 | Oct 16 | Oct 20 | Oct 24 | Oct 29 | Nov 5 |
| 28°F | Oct 14 | Oct 22 | Oct 27 | Nov 1 | Nov 5 | Nov 9 | Nov 15 | Nov 22 | Nov 28 |
| 24°F | Nov 2 | Nov 10 | Nov 16 | Nov 22 | Nov 26 | Dec 1 | Dec 5 | Dec 13 | Dec 23 |
| 20°F | Nov 16 | Nov 25 | Dec 1 | Dec 8 | Dec 13 | Dec 21 | Dec 30 | Jan 10 | Jan 27 |
| 16°F | Nov 29 | Dec 6 | Dec 14 | Dec 24 | Jan 1 | Jan 8 | Jan 18 | Jan 29 | Feb 16 |
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: Klawock Ap, Ak, about 5.4 miles away@if(!empty($station['elevation_ft'])), at 12 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 Hollis, AK?
On average, the last spring frost (32°F) around Hollis, AK is about Apr 29. In cooler years it can run later, so for a safer bet many gardeners wait until Apr 13.
When is the first frost in the fall?
The first fall frost around Hollis, AK typically arrives about Oct 16. 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 Apr 29 on average, or Apr 13 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 169 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 99925 Planting calendar → Alaska frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026