Last frost date in Beaverton, OR
In Beaverton, the last spring frost comes around April 1 in an average year. Wait until April 26 if you want 90% odds of no more frost. The first fall frost usually arrives about November 6, which leaves 222 frost-free days. An early freeze before October 19 happens one year in ten.
- Safe after (10% risk)
- Apr 26
- Average first frost
- Nov 6
- Frost-free season
- 222 days
- Hard freeze (28°F) ends
- Feb 26
No frost in the next 6 nights
National Weather Service forecast, updated Oct 22, 12:57 UTC
- ThuOct 2240°
- FriOct 2339°
- SatOct 2441°
- SunOct 2543°
- MonOct 2642°
- TueOct 2742°
Planting calendar for Beaverton
Windows count forward or back from the average frost dates above. Click a crop for dates across Oregon.
TomatoesApr 8–Apr 22
PumpkinsApr 15–Apr 29
SunflowersApr 1–Apr 22
CucumbersApr 15–Apr 22
CornApr 8–Apr 22
Sweet potatoesApr 22–May 6
WatermelonApr 15–Apr 29
Green beansApr 8–Apr 29
ZucchiniApr 8–Apr 22
OkraApr 22–May 6
PeppersApr 15–Apr 29
BasilApr 8–Apr 22
Butternut squashApr 8–Apr 22
CantaloupeApr 15–Apr 29
EggplantApr 15–Apr 29
PotatoesMar 4–Mar 18
OnionsFeb 18–Mar 11
CarrotsMar 11–Apr 15
LettuceMar 18–Apr 8
BroccoliMar 4–Mar 18
BeetsMar 4–Apr 15
PeasFeb 18–Mar 4
CabbageMar 4–Mar 18
RadishesFeb 25–Apr 8
Brussels sproutsMar 18–Apr 1
SpinachFeb 18–Mar 11
CilantroMar 18–Apr 8
KaleMar 4–Mar 18
Collard greensMar 4–Mar 18
TurnipsMar 4–Mar 18
DillApr 1–Apr 15
CeleryApr 8–Apr 15
CauliflowerMar 18–Apr 1
LeeksMar 18–Apr 1
Swiss chardMar 18–Apr 15
ParsleyMar 18–Apr 8
Tulip bulbsOct 23–Nov 27
GarlicOct 16–Nov 20
Daffodil bulbsOct 9–Nov 20
StrawberriesMar 4–Mar 18
AsparagusMar 4–Mar 18Frost probabilities
| Threshold | Spring, 90% chance later | Spring, 50% | Spring, 10% | Fall, 10% chance earlier | Fall, 50% | Fall, 90% |
|---|---|---|---|---|---|---|
| Light frost, 32°F | Mar 5 | Apr 1 | Apr 26 | Oct 19 | Nov 6 | Dec 1 |
| Hard freeze, 28°F | Jan 23 | Feb 26 | Mar 26 | Nov 6 | Nov 30 | Dec 27 |
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 Beaverton 2 SSW (USC00350595) sits 1.6 miles from the center of Beaverton at 270 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 Beaverton, OR?
The average last frost date in Beaverton is April 1, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after April 26.
When is the first frost in Beaverton?
The first frost in fall usually comes around November 6. One year in ten it arrives before October 19.
How long is the growing season in Beaverton?
About 222 days between the average last and first frost.
When should I plant tomatoes in Beaverton?
Plant tomato seedlings outside from April 8 to April 22. Start seeds indoors six to eight weeks earlier.