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

Planting zone for 92283 — Winterhaven, CA

ZIP code 92283 (Winterhaven, Imperial County) is in USDA zone 10a: the coldest winter night averages 30 to 35 °F.

Where ZIP 92283 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.

Zone10a30 to 35 °F
Coldest night−1.1 to 1.7 °C
Last frostrare
First frostrare
2012 zone10a

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 10a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Winterhaven, CA…

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

A 32 °F frost doesn't happen here in most winters. At the nearest station (NOAA station Yuma Quartermaster Depot, AZ — 14 miles away, elevation 161 ft) the median growing season is 362 days. When frost does come, it is a midwinter night or two; cover tender plants when a freeze is forecast.

Frost data: NOAA NCEI U.S. Climate Normals 1991–2020.

When spring arrived in 2026

In 2026, spring leaf-out near 92283 came on Jan 18 — 3 days earlier than the 1991–2020 average (Jan 21).

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).

Soil in Winterhaven, CA

The soil mapped at the center of ZIP 92283 is Lithic Torriorthents — very gravelly fine sandy loam, somewhat excessively drained.

TextureVery gravelly fine sandy loamdrains and warms fast; dries out and needs more feeding
pH7.8slightly alkaline; most vegetables like 6.0–7.0
DrainageSomewhat excessively drainednatural drainage class
Organic matter0.3%low — add compost
Hydrologic groupDwater soaks in very slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Lithic Torriorthents, Typic Haplocalcids, and Rock outcrop; hyperthermic hills and mountains.

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 92283; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Winterhaven, CA

Summer high109 °Faverage high, July
Winter low44 °Faverage low, December
Hot days195days a year at 90 °F or more
Freezing nights4nights a year at 32 °F or less
Growing degree days8,984base 50 °F — the season’s usable heat
Longest day14 h 19 mindaylight on June 21
Shortest day9 h 59 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation3.2 inper year, rain and melted snow

Average high and low, by month

30°40°50°60°70°80°90°100°110°120°32 °FJanuary: average high 71 °F, low 45 °F 71°45° JanFebruary: average high 75 °F, low 47 °F 75°47° FebMarch: average high 82 °F, low 52 °F 82°52° MarApril: average high 89 °F, low 56 °F 89°56° AprMay: average high 97 °F, low 62 °F 97°62° MayJune: average high 106 °F, low 69 °F 106°69° JunJuly: average high 109 °F, low 76 °F 109°76° JulAugust: average high 109 °F, low 77 °F 109°77° AugSeptember: average high 104 °F, low 69 °F 104°69° SepOctober: average high 93 °F, low 59 °F 93°59° OctNovember: average high 79 °F, low 50 °F 79°50° NovDecember: average high 69 °F, low 44 °F 69°44° Dec

Precipitation by month inches

0″1″January: 0.41 in precipitation 0.4 JanFebruary: 0.32 in precipitation 0.3 FebMarch: 0.35 in precipitation 0.3 MarApril: 0.13 in precipitation 0.1 AprMay: 0.07 in precipitation 0.1 MayJune: 0.01 in precipitation 0.0 JunJuly: 0.31 in precipitation 0.3 JulAugust: 0.25 in precipitation 0.3 AugSeptember: 0.11 in precipitation 0.1 SepOctober: 0.22 in precipitation 0.2 OctNovember: 0.25 in precipitation 0.3 NovDecember: 0.76 in precipitation 0.8 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Yuma Quartermaster Depot, AZ (14 mi away); precipitation: Yuma Quartermaster Depot, AZ (14 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

8536910a
Yuma, AZ · 14 mi
8536410a
Yuma, AZ · 15 mi
9222210a
Bard, CA · 15 mi
8536610a
Yuma, AZ · 21 mi
9225010a
Holtville, CA · 22 mi
9226610a
Palo Verde, CA · 23 mi
8535010a
Somerton, AZ · 23 mi
853289b
Cibola, AZ · 26 mi

California planting zones →

Questions about 92283

What planting zone is ZIP code 92283?

ZIP code 92283 (Winterhaven, CA) is in USDA hardiness zone 10a on the 2023 map: the coldest night of an average winter reaches 30 to 35 °F (−1.1 to 1.7 °C).

How much rain and snow does 92283 get?

About 3.2 inches of precipitation a year (NOAA 1991–2020 normals, Yuma Quartermaster Depot station).

How hot do summers get in Winterhaven, CA?

The average high peaks at 109 °F in July, with about 195 days a year at 90 °F or more.

What kind of soil does 92283 have?

The USDA soil survey maps Lithic Torriorthents at the center of ZIP 92283: very gravelly fine sandy loam, somewhat excessively drained, pH about 7.8 (slightly alkaline).

Did spring come early in Winterhaven, CA in 2026?

Spring leaf-out near 92283 came on Jan 18 in 2026, 3 days earlier than the 1991–2020 average (Jan 21), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Winterhaven, CA?

Intermediate onions: the longest day near 92283 is 14 h 19 min, so day-neutral types bulb best; long-day varieties may not bulb fully.