Dilkon, Arizona, sits in USDA hardiness zone 6b — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
The conditions favor cabbage, hazelnut, lavender, and collard greens, among others — though every individual site edits that list with its own soil, sun, and drainage.
Even in Dilkon, 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 Dilkon 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 Dilkon — soil, climate, flood, and parcel records. How we handle your address.
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Dilkon — the short answer
Dilkon, Arizona: USDA zone 6b, about 197 days between hard freezes, across 11K acres of town.
- USDA zone
- 6b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 17
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 31
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~197
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 11K 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 6b is Dilkon's average, not your lot's — a low corner or a tree line moves it. Against Dilkon's 197-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Dilkon
Each reading below is measured for Dilkon itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredDilkon runs about 197 days between hard freezes — a moderate growing season.
There is room for the full run of cool-season crops plus a warm-season main crop, but the calendar is tight enough that a late spring or early fall frost still decides how much finishes.
Time warm-season transplants to your last hard freeze, and a few weeks of season extension turns a near-miss harvest into a sure one.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredDilkon sits in USDA hardiness zone 6b.
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 Dilkon is in
Dilkon sits in the Arizona/New Mexico Plateau — EPA Level III, inside the wider North American Deserts. That is read at Dilkon's own centroid rather than borrowed from Navajo County.
What Grows in Dilkon
Every plant below cleared Dilkon's own zone 6b and its 197-day season. Each card opens that plant's Arizona profile. How we score.
Is it too late to plant in Dilkon?
For most of the year, no — what changes is which crops still fit the days remaining. Cool-season crops can go in from around Mar 20; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 17 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 31 — long-season crops need about 90 days of runway, quick greens only 30. The tail of the season still works: sixty-day crops into late summer, quick greens after, garlic last of all.
What's on the federal record near Dilkon
Closest first, within ~10 miles of Dilkon. Listing isn't leaking, and distance isn't exposure.
- 07 129-02.85X10.00Nitrate · 1900 ft
- 07 129-02.91X09.90Nitrate · 2000 ft
- 07 129-04.57X08.51Nitrate · 2.2 mi
- 07 129-04.54X08.44Nitrate · 2.2 mi
- 07 129-04.68X08.54Nitrate · 2.2 mi
- 07 129-04.59X05.76Nitrate · 4.6 mi
- 07 128-11.34X07.30Nitrate · 6.6 mi
- 07 129-06.60X03.15Nitrate · 7.8 mi
- 07 129-07.74X02.20Nitrate · 9.1 mi
- 07 128-08.70X14.95Nitrate · 9.9 mi
Measured from Dilkon'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 Dilkon.
Severity Distribution
within ~10 miles of Dilkon
Highest-Severity Sites
Know Before You Grow
- •On a private well, test for nitrates: above 10 mg/L the water needs treatment before irrigating.
Check your specific parcel in Dilkon
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 Dilkon average
Your land is one point inside Dilkon
Everything above resolves to Dilkon as a whole — one PHZM band and one 28°F frost record, read across 11K 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 Dilkon Average
Dilkon Average
- ●USDA Zones 6b, averaged across Dilkon
- ●One soil character for all of Dilkon
- ●Frost dates read at Dilkon's scale: Apr 17 to Oct 31
YOUR Parcel
- ✓Your exact zone, not Dilkon's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Dilkon
Pull a site-specific report for your exact address in Dilkon, Arizona — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Dilkon averages can't show:
We read public map data around Dilkon — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Dilkon average
How we know this about Dilkon
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 Dilkon’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 Dilkon
When does frost risk typically end in Dilkon?
The last hard freeze (28°F) in Dilkon typically lands around Apr 17, 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 May 8.
When is the first frost in Dilkon?
The first hard freeze (28°F) in Dilkon typically arrives around Oct 31, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 17, so the watching starts about Oct 1 — about 197 days after the spring freeze cleared.
How long is the growing season in Dilkon?
Measured between 28°F hard freezes, Dilkon sees about 197 frost-free days — roughly Apr 17 through Oct 31, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 8 to Oct 17, about 162 days.
Is the soil safe to grow vegetables in Dilkon?
The federal record around Dilkon is light — 20 documented sites across the 9 federal source types we checked, mostly Nitrate entries (20), the nearest Nitrate record about 0.4 miles out — and proximity to a documented site is information, not a diagnosis of any one yard. Growing food here starts from a strong position; a soil test before new food beds settles any site-specific question.
How do I protect my plants from frost in Dilkon?
From about Oct 1 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 Oct 31 (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 Oct 31. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Dilkon's scale — its 6b band and its 197-day season. Your yard writes its own version of Dilkon'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 Dilkon’s own scale
6 of the readings below were taken at Dilkon's own scale — its own ~197-day season between 28°F freezes, the 10,607 acres it covers and 20 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Dilkon's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Dilkon's own 28°F hard-freeze dates, about Apr 17 and Oct 31 and the ~197-day span between themNOAA 1991–2020 Climate Normals
- 20 documented contamination sites on the federal record near Dilkon, the closest Nitrate record about 0.4 miles out from the town centreFederal environmental registers
- Dilkon's boundary and the 10,607 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~197-day seasonGrowable Ground crop-matching engine
- The ecoregion at Dilkon's own centroid, the Arizona/New Mexico PlateauUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Dilkon's 10,607 acres read through its county's SSURGO summaryfrom Navajo County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Navajo 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 Navajo County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Dilkon's 10,607 acreswhy one lot differs from the next →
- Which side of Dilkon you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 10,607 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate record about 0.4 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 Dilkon-wide figureread your own land →
More in Arizona
Wider growing context
What grows across ArizonaDilkon sits outside our named growing regions, so Arizona as a whole is its closest context here.
Nearby growing guides