Last frost date in Richland, WA
In Richland, the last spring frost comes around April 6 in an average year. Wait until April 24 if you want 90% odds of no more frost. The first fall frost usually arrives about October 24, which leaves 200 frost-free days. An early freeze before October 10 happens one year in ten.
- Safe after (10% risk)
- Apr 24
- Average first frost
- Oct 24
- Frost-free season
- 200 days
- Hard freeze (28°F) ends
- Mar 18
Frost possible in low spots Fri night, low 35°F
National Weather Service forecast, updated Oct 22, 12:57 UTC
- ThuOct 2243°
- FriOct 2335°possible frost
- SatOct 2437°
- SunOct 2537°
- MonOct 2636°possible frost
- TueOct 2735°possible frost
Planting calendar for Richland
Windows count forward or back from the average frost dates above. Click a crop for dates across Washington.
TomatoesApr 13–Apr 27
PumpkinsApr 20–May 4
SunflowersApr 6–Apr 27
CucumbersApr 20–Apr 27
CornApr 13–Apr 27
Sweet potatoesApr 27–May 11
WatermelonApr 20–May 4
Green beansApr 13–May 4
ZucchiniApr 13–Apr 27
OkraApr 27–May 11
PeppersApr 20–May 4
BasilApr 13–Apr 27
Butternut squashApr 13–Apr 27
CantaloupeApr 20–May 4
EggplantApr 20–May 4
PotatoesMar 9–Mar 23
OnionsFeb 23–Mar 16
CarrotsMar 16–Apr 20
LettuceMar 23–Apr 13
BroccoliMar 9–Mar 23
BeetsMar 9–Apr 20
PeasFeb 23–Mar 9
CabbageMar 9–Mar 23
RadishesMar 2–Apr 13
Brussels sproutsMar 23–Apr 6
SpinachFeb 23–Mar 16
CilantroMar 23–Apr 13
KaleMar 9–Mar 23
Collard greensMar 9–Mar 23
TurnipsMar 9–Mar 23
DillApr 6–Apr 20
CeleryApr 13–Apr 20
CauliflowerMar 23–Apr 6
LeeksMar 23–Apr 6
Swiss chardMar 23–Apr 20
ParsleyMar 23–Apr 13
Tulip bulbsOct 10–Nov 14
GarlicOct 3–Nov 7
Daffodil bulbsSep 26–Nov 7
StrawberriesMar 9–Mar 23
AsparagusMar 9–Mar 23Frost probabilities
| Threshold | Spring, 90% chance later | Spring, 50% | Spring, 10% | Fall, 10% chance earlier | Fall, 50% | Fall, 90% |
|---|---|---|---|---|---|---|
| Light frost, 32°F | Mar 22 | Apr 6 | Apr 24 | Oct 10 | Oct 24 | Nov 8 |
| Hard freeze, 28°F | Mar 1 | Mar 18 | Apr 5 | Oct 20 | Nov 4 | Nov 23 |
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 Richland (USC00457015) sits 2.3 miles from the center of Richland at 373 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 Richland, WA?
The average last frost date in Richland is April 6, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after April 24.
When is the first frost in Richland?
The first frost in fall usually comes around October 24. One year in ten it arrives before October 10.
How long is the growing season in Richland?
About 200 days between the average last and first frost.
When should I plant tomatoes in Richland?
Plant tomato seedlings outside from April 13 to April 27. Start seeds indoors six to eight weeks earlier.
Nearby in Washington
- KennewickMar 28
- PascoApr 27
- Walla WallaMar 27
- Moses LakeApr 27
- YakimaApr 8
- EllensburgMay 8
- WenatcheeApr 4
- PullmanMay 6
- SpokaneApr 26
- Spokane ValleyApr 26
- Maple ValleyApr 20
- Bonney LakeApr 11