When to plant · 31 cities · zones 7a–9a
When to plant mustard greens in Washington
Direct sow mustard greens around Apr 14 — the Washington statewide median, counted from a last spring frost of Apr 14 across 597 ZIP codes and 156 NOAA stations.
The rule: Direct sow as soon as the soil can be worked in spring, and again in late summer for fall. Seed germinates fastest at 55–65 °F and may stall above 80 °F.
Washington mustard greens, 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 | Sow | First harvest | Days |
|---|---|---|---|---|
| Mustard greensGarnet Giant (Brassica juncea) | Direct sow | Apr 14 | May 14 | 30 from sow |
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.
Mustard Greens in Washington, city by city
Mustard greens, scheduled from each city's nearest NOAA station — the same dates as its frost page.
| City | Last frost | Sow | First harvest |
|---|---|---|---|
| Seattlezone 9a | Mar 13 | Mar 13 | Apr 12 |
| Spokanezone 7a | Apr 26 | Apr 26 | May 26 |
| Tacomazone 8b | Mar 8 | Mar 8 | Apr 7 |
| Vancouverzone 8b | Mar 29 | Mar 29 | Apr 28 |
| Bellevuezone 9a | Mar 8 | Mar 8 | Apr 7 |
| Kentzone 8b | Mar 20 | Mar 20 | Apr 19 |
| Everettzone 8b | Mar 24 | Mar 24 | Apr 23 |
| Spokane Valleyzone 7a | Apr 26 | Apr 26 | May 26 |
| Rentonzone 9a | Mar 13 | Mar 13 | Apr 12 |
| Federal Wayzone 8b | Mar 8 | Mar 8 | Apr 7 |
| Yakimazone 7a | Apr 8 | Apr 8 | May 8 |
| Bellinghamzone 8b | Apr 1 | Apr 1 | May 1 |
| Kirklandzone 9a | Mar 8 | Mar 8 | Apr 7 |
| Kennewickzone 7b | Mar 28 | Mar 28 | Apr 27 |
| Auburnzone 8b | Mar 20 | Mar 20 | Apr 19 |
| Redmondzone 8b | Mar 8 | Mar 8 | Apr 7 |
| Pascozone 7b | Mar 28 | Mar 28 | Apr 27 |
| Marysvillezone 8b | Mar 24 | Mar 24 | Apr 23 |
| Sammamishzone 8b | Mar 30 | Mar 30 | Apr 29 |
| Shorelinezone 9a | Mar 8 | Mar 8 | Apr 7 |
| Richlandzone 7b | Apr 6 | Apr 6 | May 6 |
| Lakewoodzone 8b | Mar 8 | Mar 8 | Apr 7 |
| Laceyzone 8b | Apr 29 | Apr 29 | May 29 |
| Olympiazone 8b | Apr 29 | Apr 29 | May 29 |
| Burienzone 9a | Mar 2 | Mar 2 | Apr 1 |
| Bothellzone 8b | Mar 8 | Mar 8 | Apr 7 |
| Bremertonzone 8b | Mar 29 | Mar 29 | Apr 28 |
| Edmondszone 9a | Mar 9 | Mar 9 | Apr 8 |
| Puyallupzone 8b | Apr 11 | Apr 11 | May 11 |
| Lynnwoodzone 9a | Mar 9 | Mar 9 | Apr 8 |
| Lake Stevenszone 8b | Mar 24 | Mar 24 | Apr 23 |
What Washington mustard greens need
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.
72-Cell Trays with 1020 Bottoms, 5-PackMust have
The cheap black nursery trays crack after one season and flex enough to break roots when you lift them. These do not. Over five seasons the price per use is lower than the throwaways.
AG-30 Frost Protection Row Cover
AG-30 buys roughly 6 °F of frost protection while passing about 70% of light — enough to carry a crop through an early-October cold snap that would otherwise end your season two weeks short.
Ultra-Fine Garden Netting, 10×33 ft, 2 pcs
A hornworm is a moth's decision made in June. Fine mesh over the bed at transplant means the moth never lands, and you never spray anything at all.
6" Micro-Tip Pruning SnipsMust have
Ninety percent of sauce-garden cutting is snipping a pepper stem or a basil node, and a fine-tipped snip does it better than any pruner. Pulling peppers by hand tears the branch.
Digital Kitchen Scale, 11 lb, g/ozMust have
Fermentation brine is a percentage of weight, not a number of spoons. Without a gram scale you are not following a fermentation recipe — you are guessing at the one number that determines whether it is safe.
One-Touch Coffee & Spice Grinder
Dried cayenne into powder in fifteen seconds. Dedicate one to chiles — grind coffee in it afterwards and you will find out exactly how well capsaicin sticks to plastic.
Half Pint (8 oz) Regular Mouth Mason Jars, 12Must have
Eight ounces is the right jar for a sauce you use by the spoonful. Open a quart of hot sauce and you are racing the fridge; open a half-pint and you finish it while it is still good.
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Mustard Greens in Washington: questions
When should I plant mustard greens in Washington?
Direct sow around Apr 14 at the statewide median; across the state that date runs from Mar 8 in the warmest tenth of Washington's ZIP codes to May 13 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 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 mustard greens be ready to harvest?
Mustard greens planted on the statewide date is ready around May 14: 30 days from sow.
More for Washington
- When to plant tomatoes
- When to plant peppers
- When to plant tomatillos
- When to plant basil
- When to plant onions
- When to plant cilantro
- When to plant carrots
Mustard Greens in every state → · Washington frost dates → · How frost-date math works →