Rainbow City, Arizona, sits in USDA hardiness zone 7a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
The conditions favor cabbage, pawpaw, california poppy, and collard greens, among others — though every individual site edits that list with its own soil, sun, and drainage.
Even in Rainbow City, 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 Rainbow City 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 Rainbow City — soil, climate, flood, and parcel records. How we handle your address.
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Rainbow City — the short answer
Rainbow City, Arizona: USDA zone 7a, about 204 days between hard freezes, across 1K acres of town.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 15
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 5
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~204
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 1K 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 Rainbow City's average, not your lot's — a low corner or a tree line moves it. Against Rainbow City's 204-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Rainbow City
Each reading below is measured for Rainbow City itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredRainbow City runs about 204 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
MeasuredRainbow City 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 Rainbow City is in
Rainbow City sits in the Arizona/New Mexico Mountains — EPA Level III, inside the wider Temperate Sierras. That is read at Rainbow City's own centroid, and it is not what its county reads: Navajo County is mostly Arizona/New Mexico Plateau. The wider page above you is answering a different question about different ground.
What Grows in Rainbow City
Every plant below cleared Rainbow City's own zone 7a and its 204-day season. Each card opens that plant's Arizona profile. How we score.
Is it too late to plant in Rainbow City?
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 18; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 15 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 5 — long-season crops need about 90 days of runway, quick greens only 30. There is slack in a calendar like this — late plantings, second rounds of favorites, and a fall bench that keeps beds working.
What's on the federal record near Rainbow City
Closest first, within ~10 miles of Rainbow City. Listing isn't leaking, and distance isn't exposure.
- WHITERIVER I H S HOSPITALBrownfields · 2.2 mi
- FORT APACHE TIMBER COBrownfields · 3.5 mi
- FORT APACHE HISTORIC DISTRICTBrownfields · 4.8 mi
- WMATUA Miner FlatPFAS · 5.2 mi
- DILKON BIA ROADS MAINT YDBrownfields · 5.5 mi
Measured from Rainbow City'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 Rainbow City.
Severity Distribution
within ~10 miles of Rainbow City
Highest-Severity Sites
Know Before You Grow
- •Near a brownfield, raised beds of imported soil give your food clean ground.
- •PFAS do not break down in groundwater. Irrigate from a tested source.
Check your specific parcel in Rainbow City
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 Rainbow City average
Your land is one point inside Rainbow City
Everything above resolves to Rainbow City as a whole — one PHZM band and one 28°F frost record, read across 1K 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 Rainbow City Average
Rainbow City Average
- ●USDA Zones 7a, averaged across Rainbow City
- ●One soil character for all of Rainbow City
- ●Frost dates read at Rainbow City's scale: Apr 15 to Nov 5
YOUR Parcel
- ✓Your exact zone, not Rainbow City's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Rainbow City
Pull a site-specific report for your exact address in Rainbow City, Arizona — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Rainbow City averages can't show:
We read public map data around Rainbow City — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Rainbow City average
How we know this about Rainbow City
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 Rainbow City’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 Rainbow City
When does frost risk typically end in Rainbow City?
The last hard freeze (28°F) in Rainbow City typically lands around Apr 15, 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 6.
When is the first frost in Rainbow City?
The first hard freeze (28°F) in Rainbow City typically arrives around Nov 5, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 22, so the watching starts about Oct 6 — about 204 days after the spring freeze cleared.
How long is the growing season in Rainbow City?
Measured between 28°F hard freezes, Rainbow City sees about 204 frost-free days — roughly Apr 15 through Nov 5, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 6 to Oct 22, about 169 days.
Is the soil safe to grow vegetables in Rainbow City?
The federal record around Rainbow City shows 5 documented sites, mostly Brownfields entries (4), the nearest Brownfields record about 2.2 miles out — a typical footprint for a growing area, and proximity to a documented site is information, not a diagnosis of any one yard. It's worth seeing which recorded sites sit closest to where you grow, and testing the soil before new food beds near any of them.
How do I protect my plants from frost in Rainbow City?
From about Oct 6 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 5 (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 5. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Rainbow City's scale — its 7a band and its 204-day season. Your yard writes its own version of Rainbow City'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 Rainbow City’s own scale
6 of the readings below were taken at Rainbow City's own scale — its own ~204-day season between 28°F freezes, the 1,393 acres it covers and 5 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Rainbow City's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Rainbow City's own 28°F hard-freeze dates, about Apr 15 and Nov 5 and the ~204-day span between themNOAA 1991–2020 Climate Normals
- 5 documented contamination sites on the federal record near Rainbow City, the closest Brownfields record about 2.2 miles out from the town centreFederal environmental registers
- Rainbow City's boundary and the 1,393 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~204-day seasonGrowable Ground crop-matching engine
- Rainbow City sits in the Arizona/New Mexico Mountains — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Rainbow City's 1,393 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 Rainbow City's 1,393 acreswhy one lot differs from the next →
- Which side of Rainbow City you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,393 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 2.2 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 Rainbow City-wide figureread your own land →
More in Arizona
Wider growing context
What grows across ArizonaRainbow City sits outside our named growing regions, so Arizona as a whole is its closest context here.
Nearby growing guides