Frost Dates for Beaverton, OR 97007

Last spring frost April 15 · First fall frost October 29 · 197 frost-free days · USDA Zone 8b

Frost probability for 97007

Frost10%50%90%
Spring (last frost)May 10April 15March 21
Fall (first frost)October 7October 29November 20

Dates come from NOAA 1971–2000 freeze probabilities at the nearest reporting station (20.2 km away); the 50% date is the median year.

Frost dates by ZIP code in Beaverton, OR

ZIPLast spring frost (50%)First fall frost (50%)Zone
97007April 15October 298b
97006April 20October 248b
97008April 11October 319a
97005April 11October 319a
97003April 15October 299a
97078April 15October 298b

Month by month in Beaverton

MonthWhat to do
JanuaryPlan your garden layout and order seeds. Research varieties suited to your frost dates.
FebruaryStart peppers and eggplant indoors 8–10 weeks before your last frost (around April 15). Start tomatoes about two weeks later, 6–8 weeks before last frost.
MarchStart herbs, basil, and squash indoors (4–6 weeks before frost). Direct sow peas, spinach, and lettuce if soil is workable.
AprilLast frost around April 15. Transplant cold-hardy crops (broccoli, kale, cabbage). Harden off tomato and pepper seedlings.
MayFrost has passed. Transplant tomatoes, peppers, and basil outdoors. Direct sow beans, cucumbers, squash, and zucchini.
JuneSuccession plant lettuce and greens. Keep beds weeded and watered consistently.
JulyHarvest regularly to encourage production. Monitor for pests and disease.
AugustMidsummer: harvest beans, zucchini, cucumbers. Start brassica seeds indoors for fall.
SeptemberFirst fall frost approaching (around October 29). Transplant fall brassicas. Sow spinach, arugula, and radishes.
OctoberFirst frost around October 29. Harvest tomatoes and peppers before frost. Cover cold-hardy crops with row covers to extend the season.
NovemberHarvest remaining cold-hardy crops: kale, carrots, and beets. Plant garlic bulbs for next year.
DecemberClean up spent plants. Add compost to beds. Rest, review, and plan next year's garden.

What grows in a 197-day season

Frequently Asked Questions

What is the last frost date for Beaverton, OR (ZIP 97007)?

The median last spring frost date for Beaverton, OR (ZIP code 97007) is around April 15. This is the 50th-percentile date — meaning half of all years see frost end before this date. Use the 10% and 90% dates to understand the full range of risk in your area.

What is the first fall frost date in Beaverton, OR?

The median first fall frost date for Beaverton, OR is around October 29. Plan to harvest or protect frost-sensitive crops like tomatoes and peppers at least a week before this date to avoid losses.

How long is the growing season in Beaverton, OR?

The frost-free growing season in Beaverton is about 197 days. This window — from your last spring frost to your first fall frost — is when warm-season vegetables thrive. Cold-hardy crops like kale, spinach, and peas can extend your season by weeks on either side.

What USDA hardiness zone is Beaverton, OR?

Based on frost date patterns, Beaverton falls approximately in 8b. USDA hardiness zones are determined by average annual minimum winter temperatures and guide both plant selection and planting timing for your location.

When should I start tomatoes indoors in Beaverton, OR?

Start tomato seeds indoors 6–8 weeks before your last frost date (around April 15). For Beaverton, that's roughly February 19 to March 4. Transplant outdoors 1–2 weeks after your last frost.

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