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

Planting zone for 92544 — Hemet, CA

ZIP code 92544 (Hemet, Riverside County) is in USDA zone 9b: the coldest winter night averages 25 to 30 °F.

Where ZIP 92544 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.

Zone9b25 to 30 °F
Coldest night−3.9 to −1.1 °C
Last frostrare
First frostrare
2012 zone9a

Was 9a on the 2012 map — half a zone warmer now. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 9b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Hemet, 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 Hemet, CA — 6 miles away, elevation 1,811 ft) the median growing season is 350 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 92544 came on Jan 18 — 8 days earlier than the 1991–2020 average (Jan 26).

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 Hemet, CA

The soil mapped at the center of ZIP 92544 is Vista — coarse sandy loam, well drained.

TextureCoarse sandy loamdrains and warms fast; dries out and needs more feeding
pH6.5neutral; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter0.75%low — add compost
Hydrologic groupBwater soaks in moderately
Farmland classNot prime farmlandUSDA classification

Map unit: Vista rocky coarse sandy loam, 2 to 35 percent slopes, eroded.

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 92544; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Hemet, CA

Summer high97 °Faverage high, August
Winter low43 °Faverage low, December
Hot days121days a year at 90 °F or more
Freezing nights13nights a year at 32 °F or less
Growing degree days6,049base 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
Precipitation11.8 inper year, rain and melted snow

Average high and low, by month

30°40°50°60°70°80°90°100°110°32 °FJanuary: average high 66 °F, low 44 °F 66°44° JanFebruary: average high 67 °F, low 46 °F 67°46° FebMarch: average high 71 °F, low 47 °F 71°47° MarApril: average high 75 °F, low 50 °F 75°50° AprMay: average high 81 °F, low 54 °F 81°54° MayJune: average high 89 °F, low 56 °F 89°56° JunJuly: average high 96 °F, low 65 °F 96°65° JulAugust: average high 97 °F, low 66 °F 97°66° AugSeptember: average high 92 °F, low 62 °F 92°62° SepOctober: average high 82 °F, low 55 °F 82°55° OctNovember: average high 73 °F, low 49 °F 73°49° NovDecember: average high 65 °F, low 43 °F 65°43° Dec

Precipitation by month inches

0″1″2″3″January: 2.40 in precipitation 2.4 JanFebruary: 2.80 in precipitation 2.8 FebMarch: 1.62 in precipitation 1.6 MarApril: 0.74 in precipitation 0.7 AprMay: 0.44 in precipitation 0.4 MayJune: 0.05 in precipitation 0.1 JunJuly: 0.19 in precipitation 0.2 JulAugust: 0.19 in precipitation 0.2 AugSeptember: 0.37 in precipitation 0.4 SepOctober: 0.51 in precipitation 0.5 OctNovember: 0.73 in precipitation 0.7 NovDecember: 1.71 in precipitation 1.7 Dec

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

Nearby ZIP codes

All 8 nearest ZIP codes share zone 9b.

925439b
Hemet, CA · 7 mi
925469b
Hemet, CA · 9 mi
925969b
Winchester, CA · 10 mi
925819b
San Jacinto, CA · 11 mi
925459b
Hemet, CA · 11 mi
925839b
San Jacinto, CA · 11 mi
925369b
Aguanga, CA · 11 mi
925929b
Temecula, CA · 12 mi

All 4 ZIP codes in Hemet → · California planting zones →

Questions about 92544

What planting zone is ZIP code 92544?

ZIP code 92544 (Hemet, CA) is in USDA hardiness zone 9b on the 2023 map: the coldest night of an average winter reaches 25 to 30 °F (−3.9 to −1.1 °C).

How much rain and snow does 92544 get?

About 11.8 inches of precipitation a year (NOAA 1991–2020 normals, Hemet station).

How hot do summers get in Hemet, CA?

The average high peaks at 97 °F in August, with about 121 days a year at 90 °F or more.

What kind of soil does 92544 have?

The USDA soil survey maps Vista at the center of ZIP 92544: coarse sandy loam, well drained, pH about 6.5 (neutral).

Did spring come early in Hemet, CA in 2026?

Spring leaf-out near 92544 came on Jan 18 in 2026, 8 days earlier than the 1991–2020 average (Jan 26), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Hemet, CA?

Intermediate onions: the longest day near 92544 is 14 h 23 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 92544 change?

Yes. The 2012 USDA map put 92544 in zone 9a; the 2023 map puts it in zone 9b. The newer map uses 1991–2020 data and more weather stations.