Last frost date in Juneau, AK
The average last frost in Juneau is May 3. By May 18 the chance of another 32°F night drops to 1 in 10. The first fall frost usually arrives about October 14, which leaves 164 frost-free days. An early freeze before October 1 happens one year in ten.
- Safe after (10% risk)
- May 18
- Average first frost
- Oct 14
- Frost-free season
- 164 days
- Hard freeze (28°F) ends
- Apr 11
Frost likely Thu night, low 29°F
National Weather Service forecast, updated Oct 22, 12:24 UTC
- ThuOct 2229°frost
- FriOct 2324°hard freeze
- SatOct 2424°hard freeze
- SunOct 2527°hard freeze
- MonOct 2629°frost
- TueOct 2729°frost
Planting calendar for Juneau
Windows count forward or back from the average frost dates above. Click a crop for dates across Alaska.
TomatoesMay 10–May 24
PumpkinsMay 17–May 31
SunflowersMay 3–May 24
CucumbersMay 17–May 24
CornMay 10–May 24
Sweet potatoesMay 24–Jun 7
WatermelonMay 17–May 31
Green beansMay 10–May 31
ZucchiniMay 10–May 24
OkraMay 24–Jun 7
PeppersMay 17–May 31
BasilMay 10–May 24
Butternut squashMay 10–May 24
CantaloupeMay 17–May 31
EggplantMay 17–May 31
PotatoesApr 5–Apr 19
OnionsMar 22–Apr 12
CarrotsApr 12–May 17
LettuceApr 19–May 10
BroccoliApr 5–Apr 19
BeetsApr 5–May 17
PeasMar 22–Apr 5
CabbageApr 5–Apr 19
RadishesMar 29–May 10
Brussels sproutsApr 19–May 3
SpinachMar 22–Apr 12
CilantroApr 19–May 10
KaleApr 5–Apr 19
Collard greensApr 5–Apr 19
TurnipsApr 5–Apr 19
DillMay 3–May 17
CeleryMay 10–May 17
CauliflowerApr 19–May 3
LeeksApr 19–May 3
Swiss chardApr 19–May 17
ParsleyApr 19–May 10
Tulip bulbsSep 30–Nov 4
GarlicSep 23–Oct 28
Daffodil bulbsSep 16–Oct 28
StrawberriesApr 5–Apr 19
AsparagusApr 5–Apr 19Frost probabilities
| Threshold | Spring, 90% chance later | Spring, 50% | Spring, 10% | Fall, 10% chance earlier | Fall, 50% | Fall, 90% |
|---|---|---|---|---|---|---|
| Light frost, 32°F | Apr 18 | May 3 | May 18 | Oct 1 | Oct 14 | Oct 29 |
| Hard freeze, 28°F | Mar 26 | Apr 11 | Apr 30 | Oct 14 | Oct 31 | Nov 14 |
Read the spring 10% column as the date after which only one year in ten still gets frost. That is the safer date for tomatoes, peppers and basil.
Where these numbers come from
NOAA station Annex Creek (USC00500363) sits 4.7 miles from the center of Juneau at 92 feet. Its averages cover 1991 to 2020. Low spots, valleys and open fields can keep getting frost a week or two after the station stops; city centers and lakeshores usually get less of it.
Questions
When is the last frost in Juneau, AK?
The average last frost date in Juneau is May 3, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after May 18.
When is the first frost in Juneau?
The first frost in fall usually comes around October 14. One year in ten it arrives before October 1.
How long is the growing season in Juneau?
About 164 days between the average last and first frost.
When should I plant tomatoes in Juneau?
Plant tomato seedlings outside from May 10 to May 24. Start seeds indoors six to eight weeks earlier.