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

Planting zone for 92646 — Huntington Beach, CA

ZIP code 92646 (Huntington Beach, Orange County) is in USDA zone 10b: the coldest winter night averages 35 to 40 °F.

Where ZIP 92646 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.

Zone10b35 to 40 °F
Coldest night1.7 to 4.4 °C
Last frostrare
First frostrare
2012 zone10b

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 10b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Huntington Beach, 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 Tustin Irvine Rch, CA — 12 miles away, elevation 236 ft) the median growing season is 365 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 92646 came on Jan 16 — 5 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 Huntington Beach, CA

The soil mapped at the center of ZIP 92646 is Hueneme — fine sandy loam, poorly drained.

TextureFine sandy loamdrains and warms fast; dries out and needs more feeding
pH7.9alkaline; most vegetables like 6.0–7.0
DrainagePoorly drainedconsider raised beds
Organic matter0.75%low — add compost
Hydrologic groupAwater soaks in fast
Farmland classPrime farmland if irrigatedUSDA classification

Map unit: Hueneme fine sandy loam, drained.

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 92646; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Huntington Beach, CA

Summer high80 °Faverage high, August
Winter low48 °Faverage low, December
Hot days13days a year at 90 °F or more
Freezing nights0nights a year at 32 °F or less
Growing degree days5,463base 50 °F — the season’s usable heat
Longest day14 h 23 mindaylight on June 21
Shortest day9 h 55 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation11.2 inper year, rain and melted snow

Average high and low, by month

40°50°60°70°80°90°January: average high 67 °F, low 49 °F 67°49° JanFebruary: average high 67 °F, low 50 °F 67°50° FebMarch: average high 68 °F, low 52 °F 68°52° MarApril: average high 70 °F, low 55 °F 70°55° AprMay: average high 71 °F, low 59 °F 71°59° MayJune: average high 74 °F, low 63 °F 74°63° JunJuly: average high 79 °F, low 66 °F 79°66° JulAugust: average high 80 °F, low 67 °F 80°67° AugSeptember: average high 80 °F, low 65 °F 80°65° SepOctober: average high 77 °F, low 59 °F 77°59° OctNovember: average high 72 °F, low 53 °F 72°53° NovDecember: average high 67 °F, low 48 °F 67°48° Dec

Precipitation by month inches

0″1″2″3″January: 2.59 in precipitation 2.6 JanFebruary: 2.64 in precipitation 2.6 FebMarch: 1.62 in precipitation 1.6 MarApril: 0.52 in precipitation 0.5 AprMay: 0.27 in precipitation 0.3 MayJune: 0.01 in precipitation 0.0 JunJuly: 0.04 in precipitation 0.0 JulAugust: 0.01 in precipitation 0.0 AugSeptember: 0.10 in precipitation 0.1 SepOctober: 0.54 in precipitation 0.5 OctNovember: 0.80 in precipitation 0.8 NovDecember: 2.04 in precipitation 2.0 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Santa Ana John Wayne Airport, CA (6 mi away); precipitation: Santa Ana John Wayne Airport, CA (6 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 10b.

9261510b
Huntington Beach, CA · <1 mi
9262710b
Costa Mesa, CA · 3 mi
9264810b
Huntington Beach, CA · 3 mi
9262810b
Costa Mesa, CA · 3 mi
9266310b
Newport Beach, CA · 3 mi
9270810b
Fountain Valley, CA · 4 mi
9262610b
Costa Mesa, CA · 4 mi
9265910b
Newport Beach, CA · 4 mi

All 6 ZIP codes in Huntington Beach → · California planting zones →

Questions about 92646

What planting zone is ZIP code 92646?

ZIP code 92646 (Huntington Beach, CA) is in USDA hardiness zone 10b on the 2023 map: the coldest night of an average winter reaches 35 to 40 °F (1.7 to 4.4 °C).

How much rain and snow does 92646 get?

About 11.2 inches of precipitation a year (NOAA 1991–2020 normals, Santa Ana John Wayne Airport station).

How hot do summers get in Huntington Beach, CA?

The average high peaks at 80 °F in August, with about 13 days a year at 90 °F or more.

What kind of soil does 92646 have?

The USDA soil survey maps Hueneme at the center of ZIP 92646: fine sandy loam, poorly drained, pH about 7.9 (alkaline).

Did spring come early in Huntington Beach, CA in 2026?

Spring leaf-out near 92646 came on Jan 16 in 2026, 5 days earlier than the 1991–2020 average (Jan 21), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Huntington Beach, CA?

Intermediate onions: the longest day near 92646 is 14 h 23 min, so day-neutral types bulb best; long-day varieties may not bulb fully.