Last spring frost
May 22
Frost Dates for Lazy Mountain, AK
First fall frost
Sep 16
Growing season
114 days
In an average year around Lazy Mountain, AK, the last spring frost (32°F) is about May 22 and the first fall frost is about Sep 16, giving roughly a 114-day growing season. To be safe most years, wait until May 9 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 22 | Jun 7 | May 28 |
| Freeze (32°F) | Jun 3 | May 22 | May 9 |
| Hard (28°F) | May 18 | May 6 | Apr 24 |
| Severe (24°F) | May 4 | Apr 22 | Apr 10 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Jun 22 | Jun 16 | Jun 12 | Jun 10 | Jun 7 | Jun 5 | Jun 3 | Jun 1 | May 28 |
| 32°F | Jun 3 | May 31 | May 28 | May 25 | May 22 | May 19 | May 16 | May 13 | May 9 |
| 28°F | May 18 | May 13 | May 10 | May 8 | May 6 | May 4 | May 2 | Apr 30 | Apr 24 |
| 24°F | May 4 | Apr 30 | Apr 28 | Apr 25 | Apr 22 | Apr 20 | Apr 17 | Apr 14 | Apr 10 |
| 20°F | Apr 26 | Apr 21 | Apr 18 | Apr 15 | Apr 12 | Apr 10 | Apr 8 | Apr 5 | Apr 3 |
| 16°F | Apr 20 | Apr 14 | Apr 9 | Apr 7 | Apr 5 | Apr 4 | Apr 2 | Mar 31 | Mar 26 |
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) | Aug 18 | Sep 1 | Sep 15 |
| Freeze (32°F) | Sep 1 | Sep 16 | Sep 28 |
| Hard (28°F) | Sep 14 | Sep 28 | Oct 9 |
| Severe (24°F) | Sep 26 | Oct 8 | Oct 22 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Aug 18 | Aug 24 | Aug 28 | Aug 31 | Sep 1 | Sep 4 | Sep 7 | Sep 10 | Sep 15 |
| 32°F | Sep 1 | Sep 6 | Sep 10 | Sep 13 | Sep 16 | Sep 18 | Sep 21 | Sep 24 | Sep 28 |
| 28°F | Sep 14 | Sep 20 | Sep 23 | Sep 25 | Sep 28 | Sep 30 | Oct 1 | Oct 5 | Oct 9 |
| 24°F | Sep 26 | Oct 1 | Oct 2 | Oct 5 | Oct 8 | Oct 10 | Oct 13 | Oct 17 | Oct 22 |
| 20°F | Oct 2 | Oct 7 | Oct 11 | Oct 14 | Oct 16 | Oct 19 | Oct 22 | Oct 25 | Oct 31 |
| 16°F | Oct 11 | Oct 16 | Oct 20 | Oct 23 | Oct 26 | Oct 28 | Nov 1 | Nov 3 | Nov 8 |
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: Lazy Mtn, Ak, about 1.8 miles away@if(!empty($station['elevation_ft'])), at 733 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 Lazy Mountain, AK?
On average, the last spring frost (32°F) around Lazy Mountain, AK is about May 22. In cooler years it can run later, so for a safer bet many gardeners wait until May 9.
When is the first frost in the fall?
The first fall frost around Lazy Mountain, AK typically arrives about Sep 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 May 22 on average, or May 9 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 114 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 99645 Planting calendar → Alaska frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026