Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated

Planting zone for 85614 — Green Valley, AZ

ZIP code 85614 (Green Valley, Pima County) is in USDA zone 9a: the coldest winter night averages 20 to 25 °F. The median last spring frost is February 25 and the first fall frost December 5.

Where ZIP 85614 is

Outlined: the ZIP code area · tap the map for the zone at any spot · scroll or pinch to zoom

Not the official USDA Plant Hardiness Zone Map. Zones come from the 2023 USDA hardiness-zone data by the PRISM Group, Oregon State University; we re-mapped and recolored them. The official map is at planthardiness.ars.usda.gov.

Zone9a20 to 25 °F
Coldest night−6.7 to −3.9 °C
Last frostFeb 25
First frostDec 5
2012 zone9a

Same zone as on the 2012 map. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 9a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Green Valley, AZ…

Forecast data: National Weather Service (api.weather.gov), public domain. This is not a warning service — for official frost and freeze warnings see weather.gov.

Frost dates in Green Valley, AZ

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostFebruary 25median — 50% chance of a later frost
Safe for tender plantsMarch 29only 10% chance of frost after
First fall frostDecember 5median — 10% chance by Nov 16
Growing season282 daysfrost-free, median

A hard freeze (28 °F) usually ends around January 28 and returns around December 19.

From the NOAA station Santa Rita Exp Range, AZ — 6 miles away, elevation 4,301 ft. NOAA NCEI U.S. Climate Normals 1991–2020, 32 °F threshold. Low spots and valleys can freeze later in spring than the station.

When to plant vegetables in 85614

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Jan 14 – Jan 28
SpinachSow outdoors · Jan 14 – Feb 4
Broccoli, cabbageStart indoors · Dec 17 – Dec 31
Broccoli, cabbageTransplant · Feb 4 – Feb 18
Onion setsPlant outdoors · Jan 28 – Feb 11
PotatoesPlant outdoors · Feb 4 – Feb 18
LettuceSow outdoors · Jan 28 – Feb 11
Carrots, beetsSow outdoors · Feb 4 – Feb 18
TomatoesStart indoors · Dec 31 – Jan 14
TomatoesTransplant · Mar 4 – Mar 18
Peppers, eggplantStart indoors · Dec 17 – Dec 31
Peppers, eggplantTransplant · Mar 11 – Mar 25
BeansSow outdoors · Mar 4 – Mar 18
Sweet cornSow outdoors · Mar 4 – Mar 18
Cucumbers, squashSow outdoors · Mar 4 – Mar 18
Fall lettuce, spinachSow outdoors · Oct 10 – Oct 24
GarlicPlant cloves · Nov 21 – Dec 26
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Feb 25) and first fall frost (Dec 5) with the rules of thumb U.S. extension services publish. Cool-season crops take a light frost; warm-season crops do best once the soil is above about 60 °F.

When spring arrived in 2026

In 2026, spring leaf-out near 85614 came on Jan 24 — 4 days earlier than the 1991–2020 average (Jan 28).

JanFebMarAprMayJun

The Spring Index marks the day when accumulated warmth is enough for lilac and honeysuckle to leaf out — a widely used signal that the growing season has started. Source: USA National Phenology Network, www.usanpn.org — Spring Indices, first leaf, 2026 (data as of 2026-09-08) and 30-year average 1991–2020 (CC BY 4.0).

Native plants for zone 9a in Arizona

492 plants native to the lower 48 states, recorded in Arizona, and rated by the USDA to survive 20 °F or colder — the bottom of zone 9a. Each links to its USDA PLANTS profile.

Trees 26

Arizona cypress50 ft · blooms spring · low shade tolerance · to −23 °FArizona madrone30 ft · blooms late spring · high shade tolerance · to −4 °FArizona sycamore80 ft · blooms early spring · high shade tolerance · to −8 °FArizona walnut50 ft · blooms late spring · high shade tolerance · to −33 °Fblack locust60 ft · blooms spring · high shade tolerance · to −37 °Fblue spruce100 ft · blooms late spring · medium shade tolerance · to −38 °F

Shrubs 109

alderleaf mountain mahogany15 ft · blooms late spring · medium shade tolerance · to −41 °FAmerican plum24 ft · blooms mid spring · high shade tolerance · to −38 °FAmerican tarwort3 ft · blooms late spring · high shade tolerance · to −23 °Fantelope bitterbrush6 ft · blooms early spring · medium shade tolerance · to −36 °FApache plume6 ft · blooms late spring · high shade tolerance · to −23 °Fbig sagebrush4 ft · blooms mid summer · high shade tolerance · to −43 °F

Wildflowers & perennials 197

alkali buttercup1 ft · blooms late spring · low shade tolerance · to −38 °Falpine bistort1 ft · blooms mid spring · high shade tolerance · to −38 °Falpine mountainsorrel1 ft · blooms mid summer · medium shade tolerance · to −43 °FAmerican alpine speedwell1 ft · blooms summer · medium shade tolerance · to −28 °FAmerican bistort1.5 ft · blooms mid spring · high shade tolerance · to −38 °FAmerican century plant6 ft · blooms indeterminate · high shade tolerance · to 12 °F

Grasses 151

alkali cordgrass3 ft · blooms late summer · high shade tolerance · to −38 °Falkali sacaton3 ft · blooms mid summer · high shade tolerance · to −38 °Falpine timothy1.4 ft · blooms late spring · medium shade tolerance · to −43 °Fanalogue sedge1.5 ft · blooms late spring · medium shade tolerance · to −38 °FArizona cottontop4 ft · blooms late summer · high shade tolerance · to −13 °FArizona fescue2 ft · blooms late spring · high shade tolerance · to −23 °F

Vines 1

western white clematis1 ft · blooms mid summer · medium shade tolerance · to −38 °F

Source: USDA, NRCS. 2026. The PLANTS Database (plants.usda.gov), National Plant Data Team — state distribution, native status and the “Temperature, Minimum” characteristic. Check light, moisture and soil needs before buying; local nurseries and your state native plant society can confirm what thrives in Green Valley, AZ.

Soil in Green Valley, AZ

The soil mapped at the center of ZIP 85614 is Sonoita — gravelly sandy loam, well drained.

TextureGravelly sandy loamdrains and warms fast; dries out and needs more feeding
pH7.5slightly alkaline; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter0.75%low — add compost
Hydrologic groupAwater soaks in fast
Farmland classNot prime farmlandUSDA classification

Map unit: Sonoita gravelly sandy loam, 1 to 8 percent slopes.

Soil Survey Staff, Natural Resources Conservation Service, USDA. Soil Survey Geographic (SSURGO) Database, via Soil Data Access, accessed 2026-10-29. The soil at the center point of ZIP 85614; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Green Valley, AZ

Summer high93 °Faverage high, June
Winter low39 °Faverage low, December
Hot days74days a year at 90 °F or more
Freezing nights17nights a year at 32 °F or less
Growing degree days5,863base 50 °F — the season’s usable heat
Longest day14 h 14 mindaylight on June 21
Shortest day10 h 04 mindaylight on December 21
Onions to growShort-daysummer days stay under about 14 h 20 min, so long-day varieties won’t bulb
Precipitation14 inper year, rain and melted snow

Average high and low, by month

30°40°50°60°70°80°90°100°32 °FJanuary: average high 61 °F, low 40 °F 61°40° JanFebruary: average high 64 °F, low 41 °F 64°41° FebMarch: average high 70 °F, low 45 °F 70°45° MarApril: average high 76 °F, low 50 °F 76°50° AprMay: average high 84 °F, low 57 °F 84°57° MayJune: average high 93 °F, low 66 °F 93°66° JunJuly: average high 92 °F, low 69 °F 92°69° JulAugust: average high 89 °F, low 68 °F 89°68° AugSeptember: average high 87 °F, low 65 °F 87°65° SepOctober: average high 79 °F, low 56 °F 79°56° OctNovember: average high 69 °F, low 47 °F 69°47° NovDecember: average high 60 °F, low 39 °F 60°39° Dec

Precipitation by month inches

0″1″2″3″4″January: 0.96 in precipitation 1.0 JanFebruary: 0.90 in precipitation 0.9 FebMarch: 0.72 in precipitation 0.7 MarApril: 0.31 in precipitation 0.3 AprMay: 0.19 in precipitation 0.2 MayJune: 0.48 in precipitation 0.5 JunJuly: 3.12 in precipitation 3.1 JulAugust: 3.06 in precipitation 3.1 AugSeptember: 1.76 in precipitation 1.8 SepOctober: 0.74 in precipitation 0.7 OctNovember: 0.75 in precipitation 0.8 NovDecember: 1.02 in precipitation 1.0 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Santa Rita Exp Range, AZ (6 mi away); precipitation: Green Valley 3.2 Sw, AZ (5 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

4 of the 8 nearest ZIP codes are in a different zone — elevation and distance from water change winter lows quickly.

856229a
Green Valley, AZ · 9 mi
856299a
Sahuarita, AZ · 15 mi
856458b
Amado, AZ · 15 mi
856468b
Tubac, AZ · 15 mi
856378a
Sonoita, AZ · 15 mi
857569a
Tucson, AZ · 18 mi
856408b
Tumacacori, AZ · 18 mi
857349a
Tucson, AZ · 18 mi

All 2 ZIP codes in Green Valley → · Arizona planting zones →

Questions about 85614

What planting zone is ZIP code 85614?

ZIP code 85614 (Green Valley, AZ) is in USDA hardiness zone 9a on the 2023 map: the coldest night of an average winter reaches 20 to 25 °F (−6.7 to −3.9 °C).

When is the last frost in Green Valley, AZ?

The median last spring frost (32 °F) near 85614 is February 25; after March 29 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Santa Rita Exp Range station.

When is the first frost in Green Valley, AZ?

The median first fall frost near 85614 is December 5, giving a median frost-free growing season of 282 days.

When should I plant tomatoes in 85614?

Start tomato seeds indoors around Dec 31 – Jan 14 and set transplants outside around Mar 4 – Mar 18, one to three weeks after the median last frost.

How much rain and snow does 85614 get?

About 14 inches of precipitation a year (NOAA 1991–2020 normals, Green Valley 3.2 Sw station).

How hot do summers get in Green Valley, AZ?

The average high peaks at 93 °F in June, with about 74 days a year at 90 °F or more.

What kind of soil does 85614 have?

The USDA soil survey maps Sonoita at the center of ZIP 85614: gravelly sandy loam, well drained, pH about 7.5 (slightly alkaline).

Did spring come early in Green Valley, AZ in 2026?

Spring leaf-out near 85614 came on Jan 24 in 2026, 4 days earlier than the 1991–2020 average (Jan 28), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Green Valley, AZ?

Short-day onions: the longest day near 85614 is 14 h 14 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.