Last frost date in Tukwila, WA
Expect the last frost in Tukwila around March 2. Frost after March 23 happens in only one year out of ten. The first fall frost usually arrives about November 23, which leaves 266 frost-free days. An early freeze before November 6 happens one year in ten.
- Safe after (10% risk)
- Mar 23
- Average first frost
- Nov 23
- Frost-free season
- 266 days
- Hard freeze (28°F) ends
- Feb 4
No frost in the next 6 nights
National Weather Service forecast, updated Oct 22, 12:57 UTC
- ThuOct 2245°
- FriOct 2340°
- SatOct 2443°
- SunOct 2544°
- MonOct 2643°
- TueOct 2743°
Planting calendar for Tukwila
Windows count forward or back from the average frost dates above. Click a crop for dates across Washington.
TomatoesMar 9–Mar 23
PumpkinsMar 16–Mar 30
SunflowersMar 2–Mar 23
CucumbersMar 16–Mar 23
CornMar 9–Mar 23
Sweet potatoesMar 23–Apr 6
WatermelonMar 16–Mar 30
Green beansMar 9–Mar 30
ZucchiniMar 9–Mar 23
OkraMar 23–Apr 6
PeppersMar 16–Mar 30
BasilMar 9–Mar 23
Butternut squashMar 9–Mar 23
CantaloupeMar 16–Mar 30
EggplantMar 16–Mar 30
PotatoesFeb 2–Feb 16
OnionsJan 19–Feb 9
CarrotsFeb 9–Mar 16
LettuceFeb 16–Mar 9
BroccoliFeb 2–Feb 16
BeetsFeb 2–Mar 16
PeasJan 19–Feb 2
CabbageFeb 2–Feb 16
RadishesJan 26–Mar 9
Brussels sproutsFeb 16–Mar 2
SpinachJan 19–Feb 9
CilantroFeb 16–Mar 9
KaleFeb 2–Feb 16
Collard greensFeb 2–Feb 16
TurnipsFeb 2–Feb 16
DillMar 2–Mar 16
CeleryMar 9–Mar 16
CauliflowerFeb 16–Mar 2
LeeksFeb 16–Mar 2
Swiss chardFeb 16–Mar 16
ParsleyFeb 16–Mar 9
Tulip bulbsNov 9–Dec 14
GarlicOct 15–Nov 30
Daffodil bulbsOct 15–Nov 30
StrawberriesFeb 2–Feb 16
AsparagusFeb 2–Feb 16Frost probabilities
| Threshold | Spring, 90% chance later | Spring, 50% | Spring, 10% | Fall, 10% chance earlier | Fall, 50% | Fall, 90% |
|---|---|---|---|---|---|---|
| Light frost, 32°F | Feb 5 | Mar 2 | Mar 23 | Nov 6 | Nov 23 | Dec 15 |
| Hard freeze, 28°F | Dec 20 | Feb 4 | Feb 28 | Nov 17 | Dec 10 | Jan 16 |
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 Seattle Tacoma International Airport (USW00024233) sits 2.8 miles from the center of Tukwila at 370 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 Tukwila, WA?
The average last frost date in Tukwila is March 2, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after March 23.
When is the first frost in Tukwila?
The first frost in fall usually comes around November 23. One year in ten it arrives before November 6.
How long is the growing season in Tukwila?
About 266 days between the average last and first frost.
When should I plant tomatoes in Tukwila?
Plant tomato seedlings outside from March 9 to March 23. Start seeds indoors six to eight weeks earlier.
Nearby in Washington
- SeaTacMar 2
- BurienMar 2
- RentonMar 13
- Des MoinesMar 2
- Mercer IslandMar 13
- KentMar 20
- BellevueMar 8
- SeattleMar 8
- CovingtonApr 20
- IssaquahMar 13
- Federal WayMar 8
- AuburnMar 20