When to plant · 26 cities · zones 6a–10a
When to plant mustard greens in Arizona
Direct sow mustard greens around Feb 18 — the Arizona statewide median, counted from a last spring frost of Feb 18 across 413 ZIP codes and 148 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.
Arizona mustard greens, by step
Statewide median last frost Feb 18, first fall frost Dec 1, 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 | Feb 18 | Mar 20 | 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 Arizona's ZIP codes resolve to; 3 of 416 ZIPs have no datable freeze and are left out.
Mustard Greens in Arizona, 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 |
|---|---|---|---|
| Phoenixzone 9b | Jan 8 | Jan 8 | Feb 7 |
| Tucsonzone 9b | Feb 5 | Feb 5 | Mar 7 |
| Mesazone 9b | Feb 1 | Feb 1 | Mar 3 |
| Gilbertzone 9b | Feb 1 | Feb 1 | Mar 3 |
| Chandlerzone 9b | Feb 1 | Feb 1 | Mar 3 |
| Glendalezone 9b | Jan 20 | Jan 20 | Feb 19 |
| Scottsdalezone 10a | Jan 27 | Jan 27 | Feb 26 |
| Peoriazone 9b | Feb 5 | Feb 5 | Mar 7 |
| Tempezone 10a | Feb 13 | Feb 13 | Mar 15 |
| Surprisezone 9b | Feb 5 | Feb 5 | Mar 7 |
| Goodyearzone 9b | Jan 7 | Jan 7 | Feb 6 |
| Buckeyezone 9b | Jan 7 | Jan 7 | Feb 6 |
| Yumazone 10a | frost rare | Jan 31 | Mar 2 |
| Avondalezone 9b | Jan 7 | Jan 7 | Feb 6 |
| Queen Creekzone 9b | Feb 1 | Feb 1 | Mar 3 |
| Flagstaffzone 6a | Jun 4 | Jun 4 | Jul 4 |
| Maricopazone 9a | Feb 23 | Feb 23 | Mar 25 |
| Casa Grandezone 9a | Feb 5 | Feb 5 | Mar 7 |
| Maranazone 9b | Apr 2 | Apr 2 | May 2 |
| Lake Havasu Cityzone 10a | Jan 5 | Jan 5 | Feb 4 |
| Prescott Valleyzone 7b | Apr 30 | Apr 30 | May 30 |
| Oro Valleyzone 9a | Apr 2 | Apr 2 | May 2 |
| Prescottzone 7b | Apr 30 | Apr 30 | May 30 |
| Sierra Vistazone 8b | Apr 18 | Apr 18 | May 18 |
| Apache Junctionzone 9b | Feb 1 | Feb 1 | Mar 3 |
| Bullhead Cityzone 10a | Jan 4 | Jan 4 | Feb 3 |
What Arizona 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 Arizona: questions
When should I plant mustard greens in Arizona?
Direct sow around Feb 18 at the statewide median; across the state that date runs from Jan 7 in the warmest tenth of Arizona's ZIP codes to May 15 in the coldest. To cut the freeze risk to one year in ten, count from Mar 11 instead of the median last frost. Use the city table for your own town.
When is the last frost in Arizona?
The ZIP-weighted median of NOAA 1991–2020 station medians is Feb 18. In the warmest tenth of Arizona's ZIP codes the median last frost falls on or before Jan 7; in the coldest tenth, on or after May 15.
When will Arizona mustard greens be ready to harvest?
Mustard greens planted on the statewide date is ready around Mar 20: 30 days from sow.
More for Arizona
- When to plant tomatoes
- When to plant peppers
- When to plant tomatillos
- When to plant basil
- When to plant cilantro
- When to plant carrots
Mustard Greens in every state → · Arizona frost dates → · How frost-date math works →