Snowflake, Arizona, sits in USDA hardiness zone 7a — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
A short list that earns its place here — cabbage, pawpaw, california poppy, and collard greens — with any one site's soil, sun, and drainage making the final cut.
Even in Snowflake, 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 Snowflake 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 Snowflake — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Snowflake — the short answer
Snowflake, Arizona: USDA zone 7a, about 186 days between hard freezes, across 22K acres of town.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 23
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 26
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~186
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 22K 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 7a is Snowflake's average, not your lot's — a low corner or a tree line moves it. Against Snowflake's 186-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Snowflake
Each reading below is measured for Snowflake itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredSnowflake runs about 186 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
MeasuredSnowflake sits in USDA hardiness zone 7a.
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 Snowflake is in
Snowflake sits in the Arizona/New Mexico Plateau — EPA Level III, inside the wider North American Deserts. That is read at Snowflake's own centroid rather than borrowed from Navajo County.
What Grows in Snowflake
Every plant below cleared Snowflake's own zone 7a and its 186-day season. Each card opens that plant's Arizona profile. How we score.
Is it too late to plant in Snowflake?
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 26; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 23 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 26 — long-season crops need about 90 days of runway, quick greens only 30. Even past midsummer there is room for a true fall garden here, and garlic planted near the close carries the momentum into next year.
What's on the federal record near Snowflake
Closest first, within ~10 miles of Snowflake. Listing isn't leaking, and distance isn't exposure.
- COPPERSTATE FARMS MANAGEMENTBrownfields · 0.7 mi
- SNOWFLAKE EXXONUnderground Storage Tanks · 0.9 mi
- ERGON ASPHALT PRODUCTS INC SNOWFLAKEToxics Release Inventory · 0.9 mi
- ALVAREZ AUTO CENTERUnderground Storage Tanks · 1.0 mi
- FIRST STUDENT, INC. #20987Underground Storage Tanks · 1.1 mi
- STONE SOUTHWEST COSuperfund · 1.1 mi
- SNOWFLAKE TIREUnderground Storage Tanks · 1.2 mi
- CIRCLE K #2700415Underground Storage Tanks · 1.2 mi
- HATCH MOTOR COMPANYUnderground Storage Tanks · 1.2 mi
- TOWN OF SNOWFLAKEUnderground Storage Tanks · 1.3 mi
- CARIOCA #18Underground Storage Tanks · 1.4 mi
- A-13-21 03DCDNitrate · 1.4 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Snowflake'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 Snowflake.
Total Sites
62
within ~10 miles of Snowflake
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Snowflake
Severity Distribution
within ~10 miles of Snowflake
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Snowflake, Nitrate runs higher than the national average — 34 sites within ~10 miles of Snowflake. That's not a problem with your land — it's information about it.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Snowflake
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 Snowflake average
Your land is one point inside Snowflake
Everything above resolves to Snowflake as a whole — one PHZM band and one 28°F frost record, read across 22K 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 Snowflake Average
Snowflake Average
- ●USDA Zones 7a, averaged across Snowflake
- ●One soil character for all of Snowflake
- ●Frost dates read at Snowflake's scale: Apr 23 to Oct 26
YOUR Parcel
- ✓Your exact zone, not Snowflake's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Snowflake
Pull a site-specific report for your exact address in Snowflake, Arizona — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Snowflake averages can't show:
We read public map data around Snowflake — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Snowflake average
How we know this about Snowflake
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 Snowflake’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 Snowflake
When does frost risk typically end in Snowflake?
The last hard freeze (28°F) in Snowflake typically lands around Apr 23, 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 14.
When is the first frost in Snowflake?
The first hard freeze (28°F) in Snowflake typically arrives around Oct 26, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 12, so the watching starts about Sep 26 — about 186 days after the spring freeze cleared.
How long is the growing season in Snowflake?
Measured between 28°F hard freezes, Snowflake sees about 186 frost-free days — roughly Apr 23 through Oct 26, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 14 to Oct 12, about 151 days.
Is the soil safe to grow vegetables in Snowflake?
The federal record around Snowflake is a meaningful one — 62 documented sites, mostly Nitrate entries (34), the nearest Brownfields record about 0.7 miles out — so a soil test before new food beds is a sensible precaution here, not a reason to hold back from growing. Remember that proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what sits where.
How do I protect my plants from frost in Snowflake?
From about Sep 26 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 26 (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 26. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Snowflake's scale — its 7a band and its 186-day season. Your yard writes its own version of Snowflake'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 Snowflake’s own scale
6 of the readings below were taken at Snowflake's own scale — its own ~186-day season between 28°F freezes, the 21,594 acres it covers and 62 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Snowflake's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Snowflake's own 28°F hard-freeze dates, about Apr 23 and Oct 26 and the ~186-day span between themNOAA 1991–2020 Climate Normals
- 62 documented contamination sites on the federal record near Snowflake, the closest Brownfields record about 0.7 miles out from the town centreFederal environmental registers
- Snowflake's boundary and the 21,594 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~186-day seasonGrowable Ground crop-matching engine
- The ecoregion at Snowflake'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 Snowflake's 21,594 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 Snowflake's 21,594 acreswhy one lot differs from the next →
- Which side of Snowflake you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 21,594 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 0.7 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 Snowflake-wide figureread your own land →
More in Arizona
Wider growing context
What grows across ArizonaSnowflake sits outside our named growing regions, so Arizona as a whole is its closest context here.
Nearby growing guides