Last frost date in Auburn, WA
Expect the last frost in Auburn around March 20. Frost after April 8 happens in only one year out of ten. The first fall frost usually arrives about November 10, which leaves 233 frost-free days. An early freeze before October 26 happens one year in ten.
- Safe after (10% risk)
- Apr 8
- Average first frost
- Nov 10
- Frost-free season
- 233 days
- Hard freeze (28°F) ends
- Feb 25
Frost possible in low spots Fri night, low 35°F
Earlier than usual: the average first frost here is November 10.
National Weather Service forecast, updated Oct 22, 12:57 UTC
- ThuOct 2240°
- FriOct 2335°possible frost
- SatOct 2438°
- SunOct 2539°
- MonOct 2639°
- TueOct 2739°
Planting calendar for Auburn
Windows count forward or back from the average frost dates above. Click a crop for dates across Washington.
TomatoesMar 27–Apr 10
PumpkinsApr 3–Apr 17
SunflowersMar 20–Apr 10
CucumbersApr 3–Apr 10
CornMar 27–Apr 10
Sweet potatoesApr 10–Apr 24
WatermelonApr 3–Apr 17
Green beansMar 27–Apr 17
ZucchiniMar 27–Apr 10
OkraApr 10–Apr 24
PeppersApr 3–Apr 17
BasilMar 27–Apr 10
Butternut squashMar 27–Apr 10
CantaloupeApr 3–Apr 17
EggplantApr 3–Apr 17
PotatoesFeb 20–Mar 6
OnionsFeb 6–Feb 27
CarrotsFeb 27–Apr 3
LettuceMar 6–Mar 27
BroccoliFeb 20–Mar 6
BeetsFeb 20–Apr 3
PeasFeb 6–Feb 20
CabbageFeb 20–Mar 6
RadishesFeb 13–Mar 27
Brussels sproutsMar 6–Mar 20
SpinachFeb 6–Feb 27
CilantroMar 6–Mar 27
KaleFeb 20–Mar 6
Collard greensFeb 20–Mar 6
TurnipsFeb 20–Mar 6
DillMar 20–Apr 3
CeleryMar 27–Apr 3
CauliflowerMar 6–Mar 20
LeeksMar 6–Mar 20
Swiss chardMar 6–Apr 3
ParsleyMar 6–Mar 27
Tulip bulbsOct 27–Dec 1
GarlicOct 20–Nov 24
Daffodil bulbsOct 13–Nov 24
StrawberriesFeb 20–Mar 6
AsparagusFeb 20–Mar 6Frost probabilities
| Threshold | Spring, 90% chance later | Spring, 50% | Spring, 10% | Fall, 10% chance earlier | Fall, 50% | Fall, 90% |
|---|---|---|---|---|---|---|
| Light frost, 32°F | Feb 27 | Mar 20 | Apr 8 | Oct 26 | Nov 10 | Nov 26 |
| Hard freeze, 28°F | Jan 19 | Feb 25 | Mar 16 | Nov 6 | Nov 24 | Dec 20 |
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 Kent (USC00454169) sits 7.9 miles from the center of Auburn at 30 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 Auburn, WA?
The average last frost date in Auburn is March 20, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after April 8.
When is the first frost in Auburn?
The first frost in fall usually comes around November 10. One year in ten it arrives before October 26.
How long is the growing season in Auburn?
About 233 days between the average last and first frost.
When should I plant tomatoes in Auburn?
Plant tomato seedlings outside from March 27 to April 10. Start seeds indoors six to eight weeks earlier.
Nearby in Washington
- KentMar 20
- Federal WayMar 8
- CovingtonApr 20
- Bonney LakeApr 11
- Des MoinesMar 2
- Maple ValleyApr 20
- PuyallupApr 11
- SeaTacMar 2
- RentonMar 13
- TacomaMar 8
- TukwilaMar 2
- South HillApr 11