Frost Dates for Spokane, WA 99208

Last spring frost May 13 · First fall frost October 3 · 143 frost-free days · USDA Zone 6b

Frost probability for 99208

Frost10%50%90%
Spring (last frost)June 7May 13April 18
Fall (first frost)September 19October 3October 17

Dates come from NOAA 1971–2000 freeze probabilities at the nearest reporting station (41.7 km away); the 50% date is the median year.

Frost dates by ZIP code in Spokane, WA

ZIPLast spring frost (50%)First fall frost (50%)Zone
99208May 13October 36b
99205May 13October 37a
99206May 6October 37a
99223May 6October 36b
99207May 6October 37a
99216May 6October 37a
99224May 13October 36b
99212May 6October 37a
99203May 15September 246b
99217May 6October 36b
99202May 6October 37a
99218May 15September 247a
99201May 15September 247a
99204May 15September 247a
99251May 15September 24Zone 5b
99258May 15September 247a

Month by month in Spokane

MonthWhat to do
JanuaryPlan your garden layout and order seeds. Research varieties suited to your frost dates.
FebruaryStart the slowest-growing crops indoors: onions, leeks, and celery (10–12 weeks before last frost).
MarchStart peppers and eggplant indoors 8–10 weeks before your last frost (around May 13). Start tomatoes about two weeks later, 6–8 weeks before last frost.
AprilStart herbs, basil, and squash indoors (4–6 weeks before frost). Direct sow peas, spinach, and lettuce if soil is workable.
MayLast frost around May 13. Transplant cold-hardy crops (broccoli, kale, cabbage). Harden off tomato and pepper seedlings.
JuneFrost has passed. Transplant tomatoes, peppers, and basil outdoors. Direct sow beans, cucumbers, squash, and zucchini.
JulySuccession plant lettuce and greens. Keep beds weeded and watered consistently.
AugustHarvest regularly to encourage production. Monitor for pests and disease.
SeptemberFirst fall frost approaching (around October 3). Transplant fall brassicas. Sow spinach, arugula, and radishes.
OctoberFirst frost around October 3. 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 143-day season

Frequently Asked Questions

What is the last frost date for Spokane, WA (ZIP 99208)?

The median last spring frost date for Spokane, WA (ZIP code 99208) is around May 13. 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 Spokane, WA?

The median first fall frost date for Spokane, WA is around October 3. 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 Spokane, WA?

The frost-free growing season in Spokane is about 143 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 Spokane, WA?

Based on frost date patterns, Spokane falls approximately in 6b. 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 Spokane, WA?

Start tomato seeds indoors 6–8 weeks before your last frost date (around May 13). For Spokane, that's roughly March 18 to April 1. Transplant outdoors 1–2 weeks after your last frost.

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