Last frost date in Cornelius, Oregon
April 16
Average last frost in spring. In an early year (1 in 10) it's over by March 26; in a late year (1 in 10) it comes after May 5.
October 26
Average first frost in fall. 1 year in 10 it comes by October 6.
Source: NOAA U.S. Climate Normals 1991–2020, station Forest Grove (USC00352997), 2.5 miles from Cornelius, elevation 180 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Mar 26 | Apr 16 | May 5 |
| First frost in fall | Oct 6 | Oct 26 | Nov 14 |
An early or late year is one in 10: 1 year in 10 the frost comes before the early date, and 1 year in 10 after the late date.
Frost-free days in an average year: 192
Planting calendar for Cornelius
Fall planting
USDA dates for places whose average first freeze is about October 30 (Cornelius: October 26).
- Black-eyed peasJune 1 – Aug 1 (past for this year)
- CucumbersJune 1 – Aug 1 (past for this year)
- Eggplant plantsJune 1 – July 1 (past for this year)
- New Zealand spinachJune 1 – Aug 1 (past for this year)
- OkraJune 1 – Aug 10 (past for this year)
- Peppers plantsJune 1 – July 20 (past for this year)
- SalsifyJune 1 – July 10 (past for this year)
- SoybeansJune 1 – July 15 (past for this year)
- Summer squashJune 1 – Aug 1 (past for this year)
- Sweet cornJune 1 – Aug 1 (past for this year)
- Sweet potatoesJune 1 – 15 (past for this year)
- Swiss chardJune 1 – Sept 10 (past for this year)
- TomatoesJune 1 – July 1 (past for this year)
- Winter squashJune 10 – July 10 (past for this year)
- Celery and celeriac plantsJune 15 – Aug 15 (past for this year)
- Broccoli plantsJuly 1 – Aug 15 (past for this year)
- Brussels sprouts plantsJuly 1 – Aug 15 (past for this year)
- Cantaloupe (muskmelon)July 1 – 15 (past for this year)
- CarrotsJuly 1 – Aug 15 (past for this year)
- Florence fennelJuly 1 – Aug 1 (past for this year)
- Lima beansJuly 1 – Aug 1 (past for this year)
- Snap beansJuly 1 – Aug 15 (past for this year)
- WatermelonJuly 1 – 15 (past for this year)
- Witloof chicoryJuly 1 – Aug 10 (past for this year)
- Cauliflower plantsJuly 15 – Aug 15 (past for this year)
- EndiveJuly 15 – Aug 15 (past for this year)
- KaleJuly 15 – Sept 1 (past for this year)
- RutabagaJuly 15 – Aug 1 (past for this year)
- PotatoesJuly 20 – Aug 10 (past for this year)
- BeetsAug 1 – Sept 1 (past for this year)
- Cabbage plantsAug 1 – Sept 1 (past for this year)
- Chinese cabbageAug 1 – Sept 15 (past for this year)
- Collards plantsAug 1 – Sept 15 (past for this year)
- Garden peasAug 1 – Sept 15 (past for this year)
- Head lettuce plantsAug 1 – Sept 15 (past for this year)
- KohlrabiAug 1 – Sept 1 (past for this year)
- ParsleyAug 1 – Sept 15 (past for this year)
- SorrelAug 1 – Sept 15 (past for this year)
- TurnipsAug 1 – Sept 15 (past for this year)
- DandelionAug 15 – Oct 1 (past for this year)
- Leaf lettuceAug 15 – Oct 1 (past for this year)
- Mustard greensAug 15 – Oct 15 (past for this year)
- RadishesAug 15 – Oct 15 (past for this year)
- SpinachSept 1 – Oct 1 (past for this year)
- Corn saladSept 15 – Nov 1Now
- Upland cressSept 15 – Nov 1Now
- Rhubarb plantsNov 1 – Dec 1Soon
- Asparagus plantsNov 15 – Jan 1Soon
USDA lists chervil and chives, garlic, horseradish, leeks, parsnips, shallots as generally spring-planted here.
Spring planting
USDA dates for places whose average last freeze is about April 20 (Cornelius: April 16).
- Corn saladFeb 15 – Apr 15
- SpinachMar 1 – Apr 15
- Cabbage plantsMar 10 – Apr 1
- Chervil and chivesMar 10 – Apr 10
- Collards plantsMar 10 – June 1
- DandelionMar 10 – Apr 10
- Garden peasMar 10 – Apr 10
- GarlicMar 10 – Apr 1
- Onion setsMar 10 – Apr 1
- RadishesMar 10 – May 10
- Rhubarb plantsMar 10 – Apr 10
- TurnipsMar 10 – Apr 1
- Asparagus plantsMar 15 – Apr 15
- Cauliflower plantsMar 15 – Apr 20
- LeeksMar 15 – Apr 15
- Onion plants plantsMar 15 – Apr 10
- Onion seedMar 15 – Apr 1
- PotatoesMar 15 – Apr 10
- ShallotsMar 15 – Apr 15
- SorrelMar 15 – May 1
- BeetsMar 20 – June 1
- Head lettuce plantsMar 20 – Apr 15
- Horseradish plantsMar 20 – Apr 20
- KaleMar 20 – Apr 10
- KohlrabiMar 20 – May 1
- Leaf lettuceMar 20 – May 15
- Mustard greensMar 20 – May 1
- ParsleyMar 20 – Apr 20
- ParsnipsMar 20 – Apr 20
- SalsifyMar 20 – May 1
- Upland cressMar 20 – May 1
- Broccoli plantsMar 25 – Apr 20
- Brussels sprouts plantsMar 25 – Apr 20
- EndiveMar 25 – Apr 15
- Florence fennelMar 25 – Apr 15
- CarrotsApr 1 – May 15
- Swiss chardApr 1 – June 15
- Celery and celeriac plantsApr 10 – May 1
- Snap beansApr 25 – June 30
- Sweet cornApr 25 – June 15
- Cantaloupe (muskmelon)May 1 – June 15
- CucumbersMay 1 – June 15
- Lima beansMay 1 – June 20
- New Zealand spinachMay 1 – June 15
- OkraMay 1 – June 1
- Summer squashMay 1 – June 15
- WatermelonMay 1 – June 15
- TomatoesMay 5 – June 10
- Black-eyed peasMay 10 – June 15
- Eggplant plantsMay 10 – June 1
- Peppers plantsMay 10 – June 1
- SoybeansMay 10 – June 20
- Sweet potatoesMay 10 – June 10
- Witloof chicoryJune 15 – July 1
USDA lists chinese cabbage as generally fall-planted here.
Planting dates: USDA Home and Garden Bulletin No. 9 (1967), “Suburban and Farm Vegetable Gardens,” tables 4 and 5 (earliest safe spring and latest safe fall dates), applied to this place's NOAA frost dates. “Plants” means setting out transplants, not sowing seed. How we match the table.
Nearby in Oregon
- Forest Grove 3 mi · last frost Apr 16
- Hillsboro 6 mi · last frost Apr 16
- Beaverton 12 mi · last frost Apr 1
- Tigard 15 mi · last frost Apr 1
- Sherwood 15 mi · last frost Mar 21