Planting zone for 92543 — Hemet, CA
ZIP code 92543 (Hemet, Riverside County) is in USDA zone 9b: the coldest winter night averages 25 to 30 °F.
Where ZIP 92543 is
Outlined: the ZIP code area · tap the map for the zone at any spot · scroll or pinch to zoomNot 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.
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 ServiceLoading 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 92543 came on Jan 20 — 5 days earlier than the 1991–2020 average (Jan 25).
Jan 252026
Jan 20
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 92543 is Exeter — fine sandy loam, well drained.
Map unit: Exeter very fine sandy loam, deep, 0 to 5 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 92543; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.
Climate in Hemet, CA
Average high and low, by month
Precipitation by month inches
NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Hemet, CA (6 mi away); precipitation: Hemet 4.1 Ene, CA (5 mi away). Daylight is calculated from latitude.
Nearby ZIP codes
All 8 nearest ZIP codes share zone 9b.
Questions about 92543
What planting zone is ZIP code 92543?
ZIP code 92543 (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 92543 get?
About 13.4 inches of precipitation a year (NOAA 1991–2020 normals, Hemet 4.1 Ene 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 92543 have?
The USDA soil survey maps Exeter at the center of ZIP 92543: fine sandy loam, well drained, pH about 7.0 (neutral).
Did spring come early in Hemet, CA in 2026?
Spring leaf-out near 92543 came on Jan 20 in 2026, 5 days earlier than the 1991–2020 average (Jan 25), according to the USA National Phenology Network Spring Index.
What kind of onions grow in Hemet, CA?
Intermediate onions: the longest day near 92543 is 14 h 24 min, so day-neutral types bulb best; long-day varieties may not bulb fully.
Did the zone for 92543 change?
Yes. The 2012 USDA map put 92543 in zone 9a; the 2023 map puts it in zone 9b. The newer map uses 1991–2020 data and more weather stations.