Last frost date in Klamath Falls, OR
In Klamath Falls, the last spring frost comes around June 9 in an average year. Wait until June 26 if you want 90% odds of no more frost. The first fall frost usually arrives about September 18, which leaves 99 frost-free days. An early freeze before September 4 happens one year in ten.
- Safe after (10% risk)
- Jun 26
- Average first frost
- Sep 18
- Frost-free season
- 99 days
- Hard freeze (28°F) ends
- May 21
Frost likely Thu night, low 31°F
National Weather Service forecast, updated Oct 22, 12:24 UTC
- ThuOct 2231°frost
- FriOct 2326°hard freeze
- SatOct 2430°frost
- SunOct 2531°frost
- MonOct 2630°frost
- TueOct 2731°frost
Planting calendar for Klamath Falls
Windows count forward or back from the average frost dates above. Click a crop for dates across Oregon.
TomatoesJun 16–Jun 30
PumpkinsJun 23–Jul 7
SunflowersJun 9–Jun 30
CucumbersJun 23–Jun 30
CornJun 16–Jun 30
Sweet potatoesJun 30–Jul 14
WatermelonJun 23–Jul 7
Green beansJun 16–Jul 7
ZucchiniJun 16–Jun 30
OkraJun 30–Jul 14
PeppersJun 23–Jul 7
BasilJun 16–Jun 30
Butternut squashJun 16–Jun 30
CantaloupeJun 23–Jul 7
EggplantJun 23–Jul 7
PotatoesMay 12–May 26
OnionsApr 28–May 19
CarrotsMay 19–Jun 23
LettuceMay 26–Jun 16
BroccoliMay 12–May 26
BeetsMay 12–Jun 23
PeasApr 28–May 12
CabbageMay 12–May 26
RadishesMay 5–Jun 16
Brussels sproutsMay 26–Jun 9
SpinachApr 28–May 19
CilantroMay 26–Jun 16
KaleMay 12–May 26
Collard greensMay 12–May 26
TurnipsMay 12–May 26
DillJun 9–Jun 23
CeleryJun 16–Jun 23
CauliflowerMay 26–Jun 9
LeeksMay 26–Jun 9
Swiss chardMay 26–Jun 23
ParsleyMay 26–Jun 16
Tulip bulbsSep 4–Oct 9
GarlicAug 28–Oct 2
Daffodil bulbsAug 21–Oct 2
StrawberriesMay 12–May 26
AsparagusMay 12–May 26The frost-free season here is short for pumpkins, sunflowers, corn, sweet potatoes, watermelon, peppers, butternut squash, cantaloupe. Start them indoors and look for early varieties.
Frost probabilities
| Threshold | Spring, 90% chance later | Spring, 50% | Spring, 10% | Fall, 10% chance earlier | Fall, 50% | Fall, 90% |
|---|---|---|---|---|---|---|
| Light frost, 32°F | May 22 | Jun 9 | Jun 26 | Sep 4 | Sep 18 | Oct 1 |
| Hard freeze, 28°F | May 2 | May 21 | Jun 12 | Sep 17 | Oct 2 | Oct 17 |
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 Klamath Falls International Airport (USW00094236) sits 5.7 miles from the center of Klamath Falls at 4,084 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 Klamath Falls, OR?
The average last frost date in Klamath Falls is June 9, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after June 26.
When is the first frost in Klamath Falls?
The first frost in fall usually comes around September 18. One year in ten it arrives before September 4.
How long is the growing season in Klamath Falls?
About 99 days between the average last and first frost.
When should I plant tomatoes in Klamath Falls?
Plant tomato seedlings outside from June 16 to June 30. Start seeds indoors six to eight weeks earlier.