Rio Verde, Arizona, sits in USDA hardiness zone 9b — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
Reliable performers under these conditions include okra, meyer lemon, california poppy, and artichoke; what your own ground favors still comes down to its soil, sun, and drainage.
Even in Rio Verde, 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 Rio Verde 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 Rio Verde — soil, climate, flood, and parcel records. How we handle your address.
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Rio Verde — the short answer
Rio Verde, Arizona: USDA zone 9b, about 345 days between hard freezes, across 3K acres of town.
- USDA zone
- 9b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Jan 15
- Maricopa County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Dec 26
- Maricopa County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~345
- Maricopa County normal — NOAA 1991–2020, nearest to this town
- Town area
- 3K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. No 30-year normal resolves at this town’s own centroid, so the hard-freeze dates are Maricopa County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 9b is Rio Verde's average, not your lot's — a low corner or a tree line moves it. Against Rio Verde's 345-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Rio Verde
Each reading below is measured for Rio Verde itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsRio Verde runs about 345 days between hard freezes (read from Maricopa County, the closest normal to Rio Verde) — close to year-round growing.
Frost is rarely the limit here; winter plantings are as real as summer ones, and the harder question is which crops shrug off the summer heat.
Grow cool-season crops through the mild winter, and choose heat-tolerant varieties for the summer beds.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredRio Verde sits in USDA hardiness zone 9b.
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 Rio Verde is in
Rio Verde sits in the Sonoran Basin and Range — EPA Level III, inside the wider North American Deserts. That is read at Rio Verde's own centroid rather than borrowed from Maricopa County.
What Grows in Rio Verde
Every plant below cleared Rio Verde's own zone 9b and its 345-day season. Each card opens that plant's Arizona profile. How we score.
Is it too late to plant in Rio Verde?
Too late for some crops, right on time for others — a growing season is a sequence, not a deadline. Cool-season crops can go in from around Jan 1; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Jan 15 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Dec 26 — long-season crops need about 90 days of runway, quick greens only 30. With almost year-round growing weather, timing is about heat and rainfall more than frost — some bench is always in play.
Documented around Rio Verde
Survey cells within 31 miles of Rio Verde checked for spotted lanternfly, none carrying a detection — a surveyed negative, not an absence of looking. Nearest documented record 320 miles off. What to watch for.
What's on the federal record near Rio Verde
Closest first, within ~10 miles of Rio Verde. Listing isn't leaking, and distance isn't exposure.
- VILLAGE GREENUnderground Storage Tanks · 0.5 mi
- RIO VERDE COUNTRY CLUBUnderground Storage Tanks · 0.6 mi
- RIO VERDE RANCH & BOX BARUnderground Storage Tanks · 1.2 mi
- A-04-07 08ABANitrate · 1.6 mi
- A-05-07 05AD UNSURVNitrate · 5.9 mi
- Dixie Copper MineMining · 6.7 mi
- R & S MATTRESS LIQUIDATORSUnderground Storage Tanks · 7.4 mi
- North Twin WellNitrate · 7.8 mi
- South Twin WellNitrate · 7.8 mi
- A-03-06 12CCA1Nitrate · 7.8 mi
- FOUNTAIN HILLSToxics Release Inventory · 7.8 mi
- BARTLETT LAKE MARINAUnderground Storage Tanks · 7.8 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Rio Verde'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 Rio Verde.
Total Sites
51
within ~10 miles of Rio Verde
Risk Level
Moderate
Highest-severity
1 Toxics Release Inventory facility
Sources Checked
within ~10 miles of Rio Verde
Severity Distribution
within ~10 miles of Rio Verde
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Rio Verde, two things run higher than the national average within ~10 miles of Rio Verde — Nitrate (26 sites) and Mining (3 sites). Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
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 well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Test soil for heavy metals (lead, arsenic, cadmium, mercury) — this is essential near any mining site.
Check your specific parcel in Rio Verde
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 Rio Verde average
Your land is one point inside Rio Verde
Everything above resolves to Rio Verde as a whole — one PHZM band, read across 3K acres, with hard-freeze dates borrowed from Maricopa County’s record because no 30-year normal resolves at this town’s own centroid. 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 Rio Verde Average
Rio Verde Average
- ●USDA Zones 9b, averaged across Rio Verde
- ●One soil character for all of Rio Verde
- ●Frost dates read at Rio Verde's scale: Jan 15 to Dec 26
YOUR Parcel
- ✓Your exact zone, not Rio Verde's 9b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Rio Verde
Pull a site-specific report for your exact address in Rio Verde, Arizona — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Rio Verde averages can't show:
We read public map data around Rio Verde — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Rio Verde average
How we know this about Rio Verde
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 Maricopa County’s record, because none resolves here; 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 Rio Verde
When does frost risk typically end in Rio Verde?
The last hard freeze (28°F) in Rio Verde typically lands around Jan 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 Feb 5.
When is the first frost in Rio Verde?
The first hard freeze (28°F) in Rio Verde typically arrives around Dec 26, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Dec 12, so the watching starts about Nov 26 — about 345 days after the spring freeze cleared.
How long is the growing season in Rio Verde?
Measured between 28°F hard freezes, Rio Verde sees about 345 frost-free days — roughly Jan 15 through Dec 26, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Feb 5 to Dec 12, about 310 days.
Is the soil safe to grow vegetables in Rio Verde?
The federal record around Rio Verde shows 51 documented sites, mostly Nitrate entries (26), the nearest Underground Storage Tanks record about 0.5 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 Rio Verde?
From about Nov 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 Dec 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 Dec 26. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Rio Verde's scale — its 9b band and its 345-day season. Your yard writes its own version of Rio Verde'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 Rio Verde’s own scale
6 of the readings below were taken at Rio Verde's own scale — the 2,771 acres it covers and 51 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Rio Verde's own USDA hardiness band, zones 9bUSDA PHZM 2023
- 51 documented contamination sites on the federal record near Rio Verde, the closest Underground Storage Tanks record about 0.5 miles out from the town centreFederal environmental registers
- Rio Verde's boundary and the 2,771 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 9b and a ~345-day seasonGrowable Ground crop-matching engine
- The ecoregion at Rio Verde's own centroid, the Sonoran Basin and RangeUS EPA Level III Ecoregions
- Lanternfly survey cells around Rio Verde checked, none carrying a detectionlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- The 28°F hard-freeze dates — Rio Verde has no normal of its own, so its county's is the closest measured readfrom Maricopa County
- Soil character — no town-scale survey exists, so Rio Verde's 2,771 acres read through its county's SSURGO summaryfrom Maricopa County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Maricopa 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 Maricopa County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Rio Verde's 2,771 acreswhy one lot differs from the next →
- Which side of Rio Verde you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 2,771 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.5 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 Rio Verde-wide figureread your own land →