When to plant · 31 cities · zones 7a–9a
When to plant tomatillos in Washington
Start Tomatillo seeds indoors around Mar 3 and transplant around Apr 21 — the Washington statewide median, counted from a last spring frost of Apr 14 across 597 ZIP codes and 156 NOAA stations.
The rule: Six weeks indoors, transplant after the last frost, and give each plant 30 inches and a large cage.
Washington tomatillos, by step
Statewide median last frost Apr 14, first fall frost Oct 25, 2027 season. Each cultivar's own indoor lead time and days to maturity, same engine as the Plan Builder.
| Cultivar | Start indoors | Plant out | First harvest | Days |
|---|---|---|---|---|
| TomatilloToma Verde | Mar 3 | Apr 21 | Jun 30 | 70 from transplant |
Tight means first harvest lands within two weeks of the median first fall frost. Statewide dates are the ZIP-weighted median of every NOAA 1991–2020 station Washington's ZIP codes resolve to; 5 of 602 ZIPs have no datable freeze and are left out.
Tomatillos in Washington, city by city
Tomatillo, scheduled from each city's nearest NOAA station — the same dates as its frost page.
| City | Last frost | Start indoors | Plant out | First harvest |
|---|---|---|---|---|
| Seattlezone 9a | Mar 13 | Jan 30 | Mar 20 | May 29 |
| Spokanezone 7a | Apr 26 | Mar 15 | May 3 | Jul 12 |
| Tacomazone 8b | Mar 8 | Jan 25 | Mar 15 | May 24 |
| Vancouverzone 8b | Mar 29 | Feb 15 | Apr 5 | Jun 14 |
| Bellevuezone 9a | Mar 8 | Jan 25 | Mar 15 | May 24 |
| Kentzone 8b | Mar 20 | Feb 6 | Mar 27 | Jun 5 |
| Everettzone 8b | Mar 24 | Feb 10 | Mar 31 | Jun 9 |
| Spokane Valleyzone 7a | Apr 26 | Mar 15 | May 3 | Jul 12 |
| Rentonzone 9a | Mar 13 | Jan 30 | Mar 20 | May 29 |
| Federal Wayzone 8b | Mar 8 | Jan 25 | Mar 15 | May 24 |
| Yakimazone 7a | Apr 8 | Feb 25 | Apr 15 | Jun 24 |
| Bellinghamzone 8b | Apr 1 | Feb 18 | Apr 8 | Jun 17 |
| Kirklandzone 9a | Mar 8 | Jan 25 | Mar 15 | May 24 |
| Kennewickzone 7b | Mar 28 | Feb 14 | Apr 4 | Jun 13 |
| Auburnzone 8b | Mar 20 | Feb 6 | Mar 27 | Jun 5 |
| Redmondzone 8b | Mar 8 | Jan 25 | Mar 15 | May 24 |
| Pascozone 7b | Mar 28 | Feb 14 | Apr 4 | Jun 13 |
| Marysvillezone 8b | Mar 24 | Feb 10 | Mar 31 | Jun 9 |
| Sammamishzone 8b | Mar 30 | Feb 16 | Apr 6 | Jun 15 |
| Shorelinezone 9a | Mar 8 | Jan 25 | Mar 15 | May 24 |
| Richlandzone 7b | Apr 6 | Feb 23 | Apr 13 | Jun 22 |
| Lakewoodzone 8b | Mar 8 | Jan 25 | Mar 15 | May 24 |
| Laceyzone 8b | Apr 29 | Mar 18 | May 6 | Jul 15 |
| Olympiazone 8b | Apr 29 | Mar 18 | May 6 | Jul 15 |
| Burienzone 9a | Mar 2 | Jan 19 | Mar 9 | May 18 |
| Bothellzone 8b | Mar 8 | Jan 25 | Mar 15 | May 24 |
| Bremertonzone 8b | Mar 29 | Feb 15 | Apr 5 | Jun 14 |
| Edmondszone 9a | Mar 9 | Jan 26 | Mar 16 | May 25 |
| Puyallupzone 8b | Apr 11 | Feb 28 | Apr 18 | Jun 27 |
| Lynnwoodzone 9a | Mar 9 | Jan 26 | Mar 16 | May 25 |
| Lake Stevenszone 8b | Mar 24 | Feb 10 | Mar 31 | Jun 9 |
What Washington tomatillos need
Toma Verde Tomatillo SeedMust have
Salsa verde is not a green tomato sauce — it is a tomatillo sauce, and the difference is the tartness and the natural pectin that makes it cling. There is no substitute.
Organic Seed Starter Potting MixMust have
Seed-starting mix is not potting soil with a nicer label — it is finer, lighter, and low in nutrients on purpose, because a seedling's first roots want air and moisture, not fertiliser.
Seedling Heat Mat + Digital ThermostatMust have
Peppers germinate on soil temperature, not air temperature. At 65 °F a habanero takes a month and half of them rot; at 85 °F it is up in eight days. The thermostat is the half that matters.
T8 Full-Spectrum Grow Lights, 1 ft 4-packMust have
A south window in March delivers a fraction of the light a pepper seedling needs, and the plant tells you by stretching. Two inches of LED above the canopy for 16 hours a day fixes it permanently.
5-Gallon Fabric Grow Bags, 5-Pack
Fabric pots air-prune roots and drain faster than a plastic pot can, which is the entire reason container tomatoes fail. Five gallons is the honest minimum for a pepper; a tomato wants ten.
Ocean Forest Potting SoilMust have
Pre-charged with enough nutrition to carry a transplant for its first month without feeding, which is exactly the window when most container plants stall.
Organic Tomato-Tone 3-4-6 with 8% CalciumMust have
The NPK ratio is the point: low nitrogen, higher potassium. Feed a tomato a high-nitrogen lawn fertiliser and you get a magnificent six-foot plant with four tomatoes on it.
58" Square Tomato Cages, 3-PackMust have
The conical wire tomato ring from the hardware store is 33 inches tall and an indeterminate San Marzano will laugh at it in July. Height and square geometry are what actually hold a loaded plant.
Garden Harvest Basket with Tool Caddy
A harvest basket that doubles as a colander means the hose rinse happens in the garden, and the dirt stays outside. On a 20-pound tomato day that is a genuine time saving.
Stainless Steel Food Mill, 3 discsMust have
A blender pulverises tomato skins and seeds into the sauce, which is where bitterness comes from. A mill separates them out — no blanching, no peeling, no ice bath. It removes an entire hour from sauce day.
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Tomatillos in Washington: questions
When should I plant tomatillos in Washington?
Transplant around Apr 21 at the statewide median; across the state that date runs from Mar 15 in the warmest tenth of Washington's ZIP codes to May 20 in the coldest. To cut the freeze risk to one year in ten, count from May 5 instead of the median last frost. Use the city table for your own town.
When do I start tomatillos seeds indoors in Washington?
Around Mar 3 for Tomatillo: 6 weeks before the statewide median last frost, on soil held at 75–85 °F.
When is the last frost in Washington?
The ZIP-weighted median of NOAA 1991–2020 station medians is Apr 14. In the warmest tenth of Washington's ZIP codes the median last frost falls on or before Mar 8; in the coldest tenth, on or after May 13.
When will Washington tomatillos be ready to harvest?
Tomatillo planted on the statewide date is ready around Jun 30: 70 days from transplant.
More for Washington
- When to plant tomatoes
- When to plant peppers
- When to plant basil
- When to plant onions
- When to plant cilantro
- When to plant carrots
- When to plant mustard greens
Tomatillos in every state → · Washington frost dates → · How frost-date math works →