Planting zone for 92673 — San Clemente, CA
ZIP code 92673 (San Clemente, Orange County) is in USDA zone 10b: the coldest winter night averages 35 to 40 °F.
Where ZIP 92673 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 10a 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 10b means →
Frost forecast — next 7 nights
live from the National Weather ServiceLoading the forecast for San Clemente, 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 Laguna Beach, CA — 11 miles away, elevation 43 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 92673 came on Jan 17 — 4 days earlier than the 1991–2020 average (Jan 21).
Jan 212026
Jan 17
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 San Clemente, CA
The soil mapped at the center of ZIP 92673 is Alo — clay, well drained.
Map unit: Alo clay, 15 to 30 percent slopes, dry.
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 92673; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.
Climate in San Clemente, CA
Average high and low, by month
Precipitation by month inches
NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Laguna Beach, CA (11 mi away); precipitation: Mission Viejo 1.3 Sse, CA (9 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.
All 3 ZIP codes in San Clemente → · California planting zones →
Questions about 92673
What planting zone is ZIP code 92673?
ZIP code 92673 (San Clemente, 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 92673 get?
About 15.3 inches of precipitation a year (NOAA 1991–2020 normals, Mission Viejo 1.3 Sse station).
How hot do summers get in San Clemente, CA?
The average high peaks at 81 °F in August, with about 4 days a year at 90 °F or more.
What kind of soil does 92673 have?
The USDA soil survey maps Alo at the center of ZIP 92673: clay, well drained, pH about 7.3 (neutral).
Did spring come early in San Clemente, CA in 2026?
Spring leaf-out near 92673 came on Jan 17 in 2026, 4 days earlier than the 1991–2020 average (Jan 21), according to the USA National Phenology Network Spring Index.
What kind of onions grow in San Clemente, CA?
Intermediate onions: the longest day near 92673 is 14 h 22 min, so day-neutral types bulb best; long-day varieties may not bulb fully.
Did the zone for 92673 change?
Yes. The 2012 USDA map put 92673 in zone 10a; the 2023 map puts it in zone 10b. The newer map uses 1991–2020 data and more weather stations.