El Capitan, Arizona, sits in USDA hardiness zone 8a — a zone band wide enough that plant choice, not possibility, is the interesting question.
Growers here do well with cabbage, fig, california poppy, and collard greens — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in El Capitan, no two yards are alike.
A low spot, a south-facing slope, or a stand of trees moves the frost date and sun across a single El Capitan lot. Enter your address and we'll score 1,086 plants against your land's actual soil, sun, and frost.
We read public map data around El Capitan — soil, climate, flood, and parcel records. How we handle your address.
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El Capitan — the short answer
El Capitan, Arizona: USDA zone 8a, about 234 days between hard freezes, across 4K acres of town.
- USDA zone
- 8a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 25
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 14
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~234
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 4K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are this town’s own 28°F normals: light frosts run a few weeks past them, and tender transplants usually wait 2–3 weeks after the last hard freeze.
Hardiness Zone Range
Zone 8a is El Capitan's average, not your lot's — a low corner or a tree line moves it. Against El Capitan's 234-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in El Capitan
Each reading below is measured for El Capitan itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredEl Capitan runs about 234 days between hard freezes — a long growing season.
There is slack for succession plantings and slow-finishing crops: many vegetables can be sown twice, and the heat-lovers have time to ripen fully.
Plan a second sowing of quick crops after the first comes out, and use the fall window most gardeners let sit idle.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredEl Capitan sits in USDA hardiness zone 8a.
The zone sets which perennials, shrubs, and fruit trees live through an average winter here — a plant rated for a colder zone is a safe bet, one rated warmer needs winter protection or gets treated as an annual.
Match perennials and fruit to the zone before you buy, so nothing you plant is a gamble against the cold.
USDA PHZM 2023
The kind of country El Capitan is in
El Capitan sits in the Arizona/New Mexico Mountains — EPA Level III, inside the wider Temperate Sierras. That is read at El Capitan's own centroid rather than borrowed from Gila County.
What Grows in El Capitan
Every plant below cleared El Capitan's own zone 8a and its 234-day season. Each card opens that plant's Arizona profile. How we score.
Is it too late to plant in El Capitan?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Feb 25; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 25 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 14 — long-season crops need about 90 days of runway, quick greens only 30. A long window like this one runs successions deep into fall — and even its last weeks take quick greens and garlic.
Documented around El Capitan
Survey cells within 31 miles of El Capitan checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 370 miles off. What to watch for.
What's on the federal record near El Capitan
Closest first, within ~10 miles of El Capitan. Listing isn't leaking, and distance isn't exposure.
- D-02-15 26BACNitrate · 1800 ft
- D-02-15 35BBBNitrate · 1.2 mi
- Silver Creek MineMining · 2.0 mi
- Silver CreekMining · 2.0 mi
- Silver DimeMining · 2.6 mi
- El CapitanMining · 2.7 mi
- El Capitan MineMining · 2.7 mi
- Josephine ClaimsMining · 2.7 mi
- Grubstake ClaimsMining · 3.0 mi
- PioneerMining · 3.1 mi
- Old Pioneer MineMining · 3.2 mi
- So and So and Extension ClaimsMining · 3.2 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from El Capitan's center, not your beds. Run your own address for what's upwind of you specifically.
Environmental Intelligence
The counts behind that headline — every source type on the record near El Capitan.
Sources Checked
within ~10 miles of El Capitan
Severity Distribution
within ~10 miles of El Capitan
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around El Capitan, Mining runs higher than the national average — 70 sites within ~10 miles of El Capitan. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Mining: Mining sites — both historic and active — can leach heavy metals (arsenic, lead, cadmium, mercury) into soil and water for centuries after operations cease.
Test soil for heavy metals (lead, arsenic, cadmium, mercury) — this is essential near any mining site.
Check your specific parcel in El Capitan
Get exact proximity distances to contamination sources for your specific parcel — plus soil, sun, drainage, and 1,086 plant recommendations.
25+ data sources read at your address, not the El Capitan average
Your land is one point inside El Capitan
Everything above resolves to El Capitan as a whole — one PHZM band and one 28°F frost record, read across 4K acres. Your parcel is one point inside that footprint. Slope, tree cover, a low spot that pools cold air, and what is in the soil are all resolved at the address, and none of them are visible at town scale. That is the honest boundary of this page, and the reason the next step is a reading of your own ground rather than a better local average.
Your Lot vs the El Capitan Average
El Capitan Average
- ●USDA Zones 8a, averaged across El Capitan
- ●One soil character for all of El Capitan
- ●Frost dates read at El Capitan's scale: Mar 25 to Nov 14
YOUR Parcel
- ✓Your exact zone, not El Capitan's 8a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in El Capitan
Pull a site-specific report for your exact address in El Capitan, Arizona — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that El Capitan averages can't show:
We read public map data around El Capitan — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the El Capitan average
How we know this about El Capitan
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this town’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at El Capitan’s own record; boundaries and acreage from US Census TIGER/Line 2025; the contamination records from the federal sources named in their beats above. Soil is not read at town grain anywhere on this page — there is no town-resolution survey in our data, which is why you will find no soil grid here rather than a statewide one wearing a local label. The resolution ledger below names every figure this page inherited.
Common questions about El Capitan
When does frost risk typically end in El Capitan?
The last hard freeze (28°F) in El Capitan typically lands around Mar 25, per NOAA 1991–2020 climate normals — earlier than the light-frost dates most charts quote. That marks the hard freeze, not the last light frost — lighter frosts keep biting past it, which is why tender transplants here wait until about Apr 15.
When is the first frost in El Capitan?
The first hard freeze (28°F) in El Capitan typically arrives around Nov 14, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 31, so the watching starts about Oct 15 — about 234 days after the spring freeze cleared.
How long is the growing season in El Capitan?
Measured between 28°F hard freezes, El Capitan sees about 234 frost-free days — roughly Mar 25 through Nov 14, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 15 to Oct 31, about 199 days.
Is the soil safe to grow vegetables in El Capitan?
The federal record around El Capitan runs heavier than most — 94 documented sites, mostly Mining entries (70), the nearest Nitrate record about 0.3 miles out — so test the soil before planting food in the ground, and raised beds with clean imported soil grow well in the meantime. Even here, proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what's recorded and where.
How do I protect my plants from frost in El Capitan?
From about Oct 15 the job here turns from planting to protecting — the last start even a 30-day crop can finish. As the season closes around the first 28°F hard freeze near Nov 14 (NOAA 1991–2020 climate normals), three moves buy time: row cover or an old sheet over tender plants on still, clear nights; water the soil the afternoon before a freeze, so it holds warmth overnight; and harvest tomatoes, peppers and basil before Nov 14. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at El Capitan's scale — its 8a band and its 234-day season. Your yard writes its own version of El Capitan's numbers: we read soil, sun, drainage and frost at your exact address. Try it for 14 days — no card required.
What this page reads at El Capitan’s own scale
7 of the readings below were taken at El Capitan's own scale — its own ~234-day season between 28°F freezes, the 3,900 acres it covers and 94 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- El Capitan's own USDA hardiness band, zones 8aUSDA PHZM 2023
- El Capitan's own 28°F hard-freeze dates, about Mar 25 and Nov 14 and the ~234-day span between themNOAA 1991–2020 Climate Normals
- 94 documented contamination sites on the federal record near El Capitan, the closest Nitrate record about 0.3 miles out from the town centreFederal environmental registers
- El Capitan's boundary and the 3,900 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8a and a ~234-day seasonGrowable Ground crop-matching engine
- The ecoregion at El Capitan's own centroid, the Arizona/New Mexico MountainsUS EPA Level III Ecoregions
- Lanternfly survey cells around El Capitan checked, none carrying a detectionlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so El Capitan's 3,900 acres read through its county's SSURGO summaryfrom Gila County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Gila County
- The growing challenges every Arizona grower plans around — written at state scale, so they stay on the state guidefrom Arizona
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Gila County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among El Capitan's 3,900 acreswhy one lot differs from the next →
- Which side of El Capitan you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 3,900 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate record about 0.3 miles out, measured from the town centrehow we read the record →
- Where cold air settles, which slopes face the sun, and which way the wind runs on your own ground — measured at your address, and averaged away by any El Capitan-wide figureread your own land →
More in Arizona
Wider growing context
What grows across ArizonaEl Capitan sits outside our named growing regions, so Arizona as a whole is its closest context here.
Nearby growing guides