Quick planting window
| Start indoors | March to April |
|---|---|
| Transplant | May to June |
| Sow seeds | Usually not recommended for this crop in a short-season garden |
| Estimated harvest | July to August |
| Risk | Medium risk |
Month calendar
Scan the year by month to see seed starting, sowing, transplanting, and harvest timing.
Tomato is frost sensitive. Wait until the conservative transplant or sowing window for Washington.
Next: ZIP code personalization
This is a state-level planning window based on typical frost timing and crop rules. Use local Extension guidance or a ZIP code frost-date tool before planting.
Planning notes
Covered crops
15
Covered states
Washington
Frost window
April to May / October to November
Adjust for the Cascades: east and west of the mountains often need different timing.
Tomato growing notes
The calendar window is only the first step. These growing details affect survival, plant vigor, and harvest quality.
Sun
Full sun, ideally 6-8+ hours.
Soil
Rich, well-drained soil with compost.
Spacing
18-24 inches for compact types; 24-36 inches for vigorous vines.
Container
Use a 5+ gallon container for patio types; larger is better.
Watering
Water deeply and consistently; avoid wetting leaves late in the day.
Common mistake
Transplanting before nights are warm enough.
Beginner tip
Harden seedlings off for 7-10 days before planting outside.
Month window table
| Crop | Spring transplant / sow | Spring harvest | Fall transplant / sow | Fall harvest |
|---|---|---|---|---|
| Tomato | May to June | July to August | July to August | September to October |
| Cucumber | May to June | July to August | July to August | September to October |
| Pepper | May to June | August to September | June to July | September to October |
| Lettuce | April to May | May to June | August to September | October to November |
| Carrot | April to May | June to July | August to September | October to November |
| Spinach | March to April | May to June | August to September | October |
| Green Bean | May to June | July to August | August to September | September to October |
| Zucchini | May to June | July to August | July to August | September to October |
| Potato | April to May | July to August | July to August | October to November |
| Broccoli | April to May | June to July | July to August | October |
| Kale | April to May | June to July | August to September | September to October |
| Onion | April to May | July to August | July to August | October to November |
| Garlic | December to January | August to September | September to October | May |
| Corn | May to June | August to September | July to August | October to November |
| Radish | April to May | May | September to October | October |
Sources and limits
This page uses Washington state-level frost windows, USDA zone ranges, and crop rules for planning. It does not replace local Extension or county-level guidance.
FAQ
When should I start spring planting in Washington?
Use the last frost window, usually April to May, as the planning anchor. Hardy crops can start earlier; frost-sensitive crops should wait for warmer soil and nights.
When should I plan fall planting in Washington?
Count backward from the first frost window, usually October to November. Long-season and frost-sensitive crops need more lead time.
Which vegetables are easiest in Washington?
Start with easier crops such as cucumber, lettuce, spinach, green bean, zucchini. The best choice still depends on season and local conditions.
How should I handle summer heat in Washington?
Summer heat is less severe than in hot southern states, but cool-season crops still benefit from avoiding the hottest weeks.
Can I grow a fall garden in Washington?
Yes. Use October to November as the cutoff anchor and leave buffer time for germination, transplant shock, and maturity.
Do local differences matter?
Adjust for the Cascades: east and west of the mountains often need different timing.
Does this replace local Extension guidance?
No. Use this as a first-pass planning calendar, then confirm with local Extension, county guidance, or a ZIP-code frost-date tool before planting.