Washington · zones 6b–9a
When to plant cherry tomatoes in Washington.
Sow or transplant between Apr 21 to Jun 21 in a typical year, keyed to Washington's median last frost around Apr 14. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Cherry Tomatoes dates for a typical Washington season.
1 · Start indoors
Mar 10 to May 10
About 6 weeks before set-out. Warm spot, real light.
2 · Set out
Apr 21 to Jun 21
Keyed to the ~Apr 14 last frost. Sow 0.25" deep, 24" apart.
Harvest
~57 days later
~8 lb per plant over ~10 weeks.
Washington spans more than one climate: Zone 8 is the most common zone, but the state runs 6b to 9a. That's why the planner works from your ZIP code's frost dates, not your zone: mountain and coastal gardens in the same state can be three weeks apart.
In Washington: watch for
The pests that find cherry tomatoes here.
A middle-length season, about 187 frost-free days, means tomato, cherry overlaps tomato hornworm for a stretch each summer. Check plants every week or two and treat early.
Big green caterpillars strip leaves and leave black droppings.
Organic fix: Handpick at dusk; spray Bt on the young ones.
Clusters on new growth, sticky leaves, curling tips.
Organic fix: Blast with water, then insecticidal soap or neem.
Dark spots with concentric rings, starting on the lowest, oldest leaves.
Organic fix: Remove affected leaves, mulch to stop soil splash, space for airflow.
Greasy, water-soaked blotches in cool, wet spells. No rings, and not bottom-up.
Organic fix: Pull infected plants fast, keep leaves dry, use neem as a preventive.
Septoria leaf spot
Many small tan spots with dark brown edges, low leaves first, no rings inside.
Organic fix: Strip the lowest leaves, mulch against soil splash, stake for airflow.
Your season math: Washington gives cherry tomatoes about 187 frost-free days, and it needs roughly 57 days to a first harvest. It's a one-planting crop, so time that single sowing well.
Planting cherry tomatoes in Washington: questions
When should I plant cherry tomatoes in Washington?+
In a typical Washington year, sow cherry tomatoes or set out transplants between Apr 21 to Jun 21, keyed to the state's median last frost around Apr 14. Your exact dates shift with your ZIP code and microclimate.
When do I start cherry tomatoes seeds indoors in Washington?+
Start seeds inside about 6 weeks before set-out: roughly Mar 10 to May 10 for a typical Washington season.
What USDA zone is Washington?+
Washington spans zones 6b–9a, mostly zone 8. But frost dates, not zones, set planting time. The free planner uses your ZIP code's actual frost dates.
How many cherry tomatoes plants do I need?+
Depends who you're feeding. The crop page has exact counts per household size, or the free planner does the math for your family in about 60 seconds.