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Will it freeze in Juneau in the next 7 nights?
The earliest overnight low at or below 32°F in the available NWS frost forecast is Tonight: 32°F (Thu, Nov 5, 6:00 PM AKST to Fri, Nov 6, 6:00 AM AKST).
Tonight: forecast low 32°F. Freeze.
NWS forecast period: Thu, Nov 5, 6:00 PM AKST to Fri, Nov 6, 6:00 AM AKST.
7 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 32°F Freeze · Rain And Snow
- Fri, Nov 6 33°F Frost possible · Rain And Snow
- Sat, Nov 7 30°F Freeze · Light Snow
- Sun, Nov 8 30°F Freeze · Light Snow
- Mon, Nov 9 30°F Freeze · Light Snow
- Tue, Nov 10 31°F Freeze · Light Snow
- Wed, Nov 11 30°F Freeze · Light Snow 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 Juneau
The median first fall hard-freeze date (28°F) is October 31, from NOAA’s 1991–2020 Climate Normals at Annex Creek. 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 4 · May 19 · Jun 1 | Sep 17 · Sep 29 · Oct 13 | 132 days |
| 32°F freeze | Apr 18 · May 3 · May 18 | Oct 1 · Oct 14 · Oct 29 | 164 days |
| 28°F hard freeze | Mar 26 · Apr 11 · Apr 30 | Oct 14 · Oct 31 · Nov 14 | 200 days |
Average high temperature by month
1991–2020 normals at Annex Creek
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 Juneau, AK come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Annex Creek (station USC00500363, elevation 92 ft), 4.7 mi from Juneau. 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 Juneau
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Sitka, AK | 93 mi | May 3 | Oct 18 |
| Ketchikan, AK | 229 mi | Apr 4 | Nov 9 |
Frequently asked questions
When is the last frost in Juneau?
On average, the last spring frost (32°F) in Juneau is around May 3. In about 1 year in 10 it comes after May 18, and in 9 years in 10 it comes after April 18.
When is the first frost in Juneau?
The first fall frost (32°F) usually arrives around October 14. There’s a 10% chance of a freeze by October 1 and a 90% chance by October 29.
Can it frost in Juneau 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 19.
What growing zone is Juneau?
Juneau is in USDA Plant Hardiness Zone 6a (average annual extreme minimum temperature −10 to −5°F), based on the 2023 USDA map for ZIP code 99801. See growing zones in Alaska.
More: all Alaska frost dates · Alaska growing zones · UV index today in Juneau · frost vs. freeze