Last frost date in Moses Lake, WA
Expect the last frost in Moses Lake around April 27. Frost after May 11 happens in only one year out of ten. The first fall frost usually arrives about October 8, which leaves 165 frost-free days. An early freeze before September 29 happens one year in ten.
- Safe after (10% risk)
- May 11
- Average first frost
- Oct 8
- Frost-free season
- 165 days
- Hard freeze (28°F) ends
- Apr 10
Frost likely Fri night, low 30°F
National Weather Service forecast, updated Oct 22, 12:24 UTC
- ThuOct 2239°
- FriOct 2330°frost
- SatOct 2433°possible frost
- SunOct 2534°possible frost
- MonOct 2631°frost
- TueOct 2731°frost
Planting calendar for Moses Lake
Windows count forward or back from the average frost dates above. Click a crop for dates across Washington.
TomatoesMay 4–May 18
PumpkinsMay 11–May 25
SunflowersApr 27–May 18
CucumbersMay 11–May 18
CornMay 4–May 18
Sweet potatoesMay 18–Jun 1
WatermelonMay 11–May 25
Green beansMay 4–May 25
ZucchiniMay 4–May 18
OkraMay 18–Jun 1
PeppersMay 11–May 25
BasilMay 4–May 18
Butternut squashMay 4–May 18
CantaloupeMay 11–May 25
EggplantMay 11–May 25
PotatoesMar 30–Apr 13
OnionsMar 16–Apr 6
CarrotsApr 6–May 11
LettuceApr 13–May 4
BroccoliMar 30–Apr 13
BeetsMar 30–May 11
PeasMar 16–Mar 30
CabbageMar 30–Apr 13
RadishesMar 23–May 4
Brussels sproutsApr 13–Apr 27
SpinachMar 16–Apr 6
CilantroApr 13–May 4
KaleMar 30–Apr 13
Collard greensMar 30–Apr 13
TurnipsMar 30–Apr 13
DillApr 27–May 11
CeleryMay 4–May 11
CauliflowerApr 13–Apr 27
LeeksApr 13–Apr 27
Swiss chardApr 13–May 11
ParsleyApr 13–May 4
Tulip bulbsSep 24–Oct 29
GarlicSep 17–Oct 22
Daffodil bulbsSep 10–Oct 22
StrawberriesMar 30–Apr 13
AsparagusMar 30–Apr 13Frost probabilities
| Threshold | Spring, 90% chance later | Spring, 50% | Spring, 10% | Fall, 10% chance earlier | Fall, 50% | Fall, 90% |
|---|---|---|---|---|---|---|
| Light frost, 32°F | Apr 10 | Apr 27 | May 11 | Sep 29 | Oct 8 | Oct 23 |
| Hard freeze, 28°F | Mar 21 | Apr 10 | Apr 30 | Oct 5 | Oct 20 | Nov 5 |
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 Moses Lake Grant County Airport (USW00024110) sits 5.9 miles from the center of Moses Lake at 1,196 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 Moses Lake, WA?
The average last frost date in Moses Lake is April 27, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after May 11.
When is the first frost in Moses Lake?
The first frost in fall usually comes around October 8. One year in ten it arrives before September 29.
How long is the growing season in Moses Lake?
About 165 days between the average last and first frost.
When should I plant tomatoes in Moses Lake?
Plant tomato seedlings outside from May 4 to May 18. Start seeds indoors six to eight weeks earlier.
Nearby in Washington
- WenatcheeApr 4
- RichlandApr 6
- PascoApr 27
- EllensburgMay 8
- KennewickMar 28
- YakimaApr 8
- Walla WallaMar 27
- SpokaneApr 26
- Spokane ValleyApr 26
- PullmanMay 6
- Maple ValleyApr 20
- IssaquahMar 13