Checking current alerts… View NWS forecast and alerts.
Will it freeze in Sitka in the next 7 nights?
No overnight lows at or below 32°F are forecast in Sitka during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 42°F. Above 36°F.
NWS forecast period: Thu, Nov 5, 6:00 PM AKST to Fri, Nov 6, 6:00 AM AKST.
No nights at or below 36°F in the National Weather Service forecast for the next 7 nights.
- Tonight 42°F Above 36°F · Heavy Rain
- Fri, Nov 6 40°F Above 36°F · Light Rain
- Sat, Nov 7 38°F Above 36°F · Light Rain
- Sun, Nov 8 38°F Above 36°F · Rain
- Mon, Nov 9 40°F Above 36°F · Light Rain
- Tue, Nov 10 40°F Above 36°F · Light Rain
- Wed, Nov 11 38°F Above 36°F · Light Rain Likely
Overnight lows from the National Weather Service forecast for this location. This covers the available forecast window, not the first freeze of the whole season. Frost can form above 32°F on clear, calm nights.
Frost and freeze probabilities
Freeze dates shift from year to year. Spring percentages describe the chance of a freeze after the stated date; fall percentages describe the chance of a freeze by that date. The 10% spring date is the cautious one: a later freeze happens about 1 year in 10.
These dates describe historical probabilities, not this year’s forecast or the earliest and latest possible freezes. Different weather stations or probability thresholds can produce different published dates for the same city.
Average first hard freeze in Sitka
The median first fall hard-freeze date (28°F) is November 10, from NOAA’s 1991–2020 Climate Normals at Sitka 1 NE. This is the 50% probability date, not a forecast for this year.
| Temperature | Last spring date 90% · 50% · 10% chance of a later freeze | First fall date 10% · 50% · 90% chance of an earlier freeze | Season |
|---|---|---|---|
| 36°F frost possible | May 6 · May 23 · Jun 4 | Sep 20 · Oct 2 · Oct 22 | 132 days |
| 32°F freeze | Apr 16 · May 3 · May 19 | Oct 1 · Oct 18 · Nov 7 | 166 days |
| 28°F hard freeze | Mar 16 · Apr 7 · Apr 30 | Oct 19 · Nov 10 · Dec 2 | 212 days |
Average high temperature by month
1991–2020 normals at Sitka 1 NE
Average low temperature by month
Months with lows near or below freezing carry frost risk
Where these frost dates come from
The frost dates for Sitka, AK come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Sitka 1 NE (station USW00025379, elevation 78 ft), 9.5 mi from Sitka. Local conditions (valleys, hilltops, distance to water, city heat) can shift frost dates by days or weeks. The hardiness zone is from the 2023 USDA Plant Hardiness Zone Map (USDA ARS and Oregon State University PRISM). See our methodology.
Frost dates near Sitka
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Juneau, AK | 93 mi | May 3 | Oct 14 |
Frequently asked questions
When is the last frost in Sitka?
On average, the last spring frost (32°F) in Sitka is around May 3. In about 1 year in 10 it comes after May 19, and in 9 years in 10 it comes after April 16.
When is the first frost in Sitka?
The first fall frost (32°F) usually arrives around October 18. There’s a 10% chance of a freeze by October 1 and a 90% chance by November 7.
Can it frost in Sitka after the last frost date?
Yes. Frost can form on clear, calm nights even when the air stays above 32°F. Temperatures of 36°F or lower, cold enough for frost on exposed plants, have a 50% chance of occurring after May 23.
What growing zone is Sitka?
Sitka is in USDA Plant Hardiness Zone 7b (average annual extreme minimum temperature 5 to 10°F), based on the 2023 USDA map for ZIP code 99835. See growing zones in Alaska.
More: all Alaska frost dates · Alaska growing zones · frost vs. freeze