Frost Dates for Lynden, WA 98264

Last spring frost April 19 · First fall frost October 18 · 182 frost-free days · USDA Zone 8a

Frost probability for 98264

Frost10%50%90%
Spring (last frost)May 4April 19March 31
Fall (first frost)October 4October 18November 3

Dates come from NOAA 1971–2000 freeze probabilities at the nearest reporting station (24.7 km away); the 50% date is the median year.

Month by month in Lynden

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 19). 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 19. 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 18). Transplant fall brassicas. Sow spinach, arugula, and radishes.
OctoberFirst frost around October 18. 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 182-day season

Frequently Asked Questions

What is the last frost date for Lynden, WA (ZIP 98264)?

The median last spring frost date for Lynden, WA (ZIP code 98264) is around April 19. 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 Lynden, WA?

The median first fall frost date for Lynden, WA is around October 18. 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 Lynden, WA?

The frost-free growing season in Lynden is about 182 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 Lynden, WA?

Based on frost date patterns, Lynden falls approximately in 8a. 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 Lynden, WA?

Start tomato seeds indoors 6–8 weeks before your last frost date (around April 19). For Lynden, that's roughly February 23 to March 8. Transplant outdoors 1–2 weeks after your last frost.

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