Last frost date in Gresham, OR

Average last frost
March 16

The average last frost in Gresham is March 16. By April 12 the chance of another 32°F night drops to 1 in 10. The first fall frost usually arrives about November 20, which leaves 250 frost-free days. An early freeze before October 30 happens one year in ten.

Safe after (10% risk)
Apr 12
Average first frost
Nov 20
Frost-free season
250 days
Hard freeze (28°F) ends
Feb 14
Next 6 nights in Gresham

No frost in the next 6 nights

National Weather Service forecast, updated Oct 22, 12:24 UTC

  1. ThuOct 2242°
  2. FriOct 2338°
  3. SatOct 2442°
  4. SunOct 2544°
  5. MonOct 2642°
  6. TueOct 2741°
JanFebMarAprMayJunJulAugSepOctNovDecLast frost Mar 16First frost Nov 20250 frost-free daysBlue: chance of 32°F frost. Green: average frost-free season.JFMAMJJASOND250 frost-free days
Frost risk through the year at Portland Troutdale Airport, 3.7 miles from Gresham.

Planting calendar for Gresham

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 bulbsNov 6–Dec 11
GarlicOct 15–Nov 30
Daffodil bulbsOct 15–Nov 30
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 18Mar 16Apr 12Oct 30Nov 20Dec 17
Hard freeze, 28°FDec 27Feb 14Mar 10Nov 15Dec 15Feb 3

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 Portland Troutdale Airport (USW00024242) sits 3.7 miles from the center of Gresham at 29 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 Gresham, OR?

The average last frost date in Gresham is March 16, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after April 12.

When is the first frost in Gresham?

The first frost in fall usually comes around November 20. One year in ten it arrives before October 30.

How long is the growing season in Gresham?

About 250 days between the average last and first frost.

When should I plant tomatoes in Gresham?

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