Last frost date in Woodburn, OR

Average last frost
March 16

In Woodburn, the last spring frost comes around March 16 in an average year. Wait until April 7 if you want 90% odds of no more frost. The first fall frost usually arrives about November 14, which leaves 242 frost-free days. An early freeze before October 27 happens one year in ten.

Safe after (10% risk)
Apr 7
Average first frost
Nov 14
Frost-free season
242 days
Hard freeze (28°F) ends
Feb 15
Next 6 nights in Woodburn

Frost possible in low spots Thu night, low 34°F

Earlier than usual: the average first frost here is November 14.

National Weather Service forecast, updated Oct 22, 12:57 UTC

  1. ThuOct 2234°possible frost
  2. FriOct 2333°possible frost
  3. SatOct 2436°possible frost
  4. SunOct 2538°
  5. MonOct 2637°
  6. TueOct 2736°possible frost
JanFebMarAprMayJunJulAugSepOctNovDecLast frost Mar 16First frost Nov 14242 frost-free daysBlue: chance of 32°F frost. Green: average frost-free season.JFMAMJJASOND242 frost-free days
Frost risk through the year at Aurora State Airport, 8.3 miles from Woodburn.

Planting calendar for Woodburn

Windows count forward or back from the average frost dates above. Click a crop for dates across Oregon.

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost
Warm-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
TomatoesMar 23–Apr 6
PumpkinsMar 30–Apr 13
SunflowersMar 16–Apr 6
CucumbersMar 30–Apr 6
CornMar 23–Apr 6
Sweet potatoesApr 6–Apr 20
WatermelonMar 30–Apr 13
Green beansMar 23–Apr 13
ZucchiniMar 23–Apr 6
OkraApr 6–Apr 20
PeppersMar 30–Apr 13
BasilMar 23–Apr 6
Butternut squashMar 23–Apr 6
CantaloupeMar 30–Apr 13
EggplantMar 30–Apr 13
Cool-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
PotatoesFeb 16–Mar 2
OnionsFeb 2–Feb 23
CarrotsFeb 23–Mar 30
LettuceMar 2–Mar 23
BroccoliFeb 16–Mar 2
BeetsFeb 16–Mar 30
PeasFeb 2–Feb 16
CabbageFeb 16–Mar 2
RadishesFeb 9–Mar 23
Brussels sproutsMar 2–Mar 16
SpinachFeb 2–Feb 23
CilantroMar 2–Mar 23
KaleFeb 16–Mar 2
Collard greensFeb 16–Mar 2
TurnipsFeb 16–Mar 2
DillMar 16–Mar 30
CeleryMar 23–Mar 30
CauliflowerMar 2–Mar 16
LeeksMar 2–Mar 16
Swiss chardMar 2–Mar 30
ParsleyMar 2–Mar 23
Fall bulbs and garlic
JanFebMarAprMayJunJulAugSepOctNovDec
Tulip bulbsOct 31–Dec 5
GarlicOct 24–Nov 28
Daffodil bulbsOct 17–Nov 28
Perennials
JanFebMarAprMayJunJulAugSepOctNovDec
StrawberriesFeb 16–Mar 2
AsparagusFeb 16–Mar 2

Frost probabilities

ThresholdSpring, 90% chance laterSpring, 50%Spring, 10%Fall, 10% chance earlierFall, 50%Fall, 90%
Light frost, 32°FFeb 21Mar 16Apr 7Oct 27Nov 14Dec 6
Hard freeze, 28°FJan 4Feb 15Mar 8Nov 9Dec 1Dec 30

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 Aurora State Airport (USW00094281) sits 8.3 miles from the center of Woodburn at 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 Woodburn, OR?

The average last frost date in Woodburn is March 16, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after April 7.

When is the first frost in Woodburn?

The first frost in fall usually comes around November 14. One year in ten it arrives before October 27.

How long is the growing season in Woodburn?

About 242 days between the average last and first frost.

When should I plant tomatoes in Woodburn?

Plant tomato seedlings outside from March 23 to April 6. Start seeds indoors six to eight weeks earlier.

Nearby in Oregon

All 34 cities in Oregon