Planting zone for 92066 — Ranchita, CA
ZIP code 92066 (Ranchita, San Diego County) is in USDA zone 9a: the coldest winter night averages 20 to 25 °F.
Where ZIP 92066 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 8b 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 9a means →
Frost forecast — next 7 nights
live from the National Weather ServiceLoading the forecast for Ranchita, 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 Borrego Desert Park, CA — 8 miles away, elevation 810 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 92066 came on Jan 24 — 11 days earlier than the 1991–2020 average (Feb 4).
Feb 42026
Jan 24
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 Ranchita, CA
The soil mapped at the center of ZIP 92066 is Calpine — coarse sandy loam, well drained.
Map unit: Calpine coarse sandy loam, 5 to 9 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 92066; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.
Climate in Ranchita, CA
Average high and low, by month
Precipitation by month inches
NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Borrego Desert Park, CA (8 mi away); precipitation: Borrego Desert Park, CA (8 mi away). Daylight is calculated from latitude.
Nearby ZIP codes
6 of the 8 nearest ZIP codes are in a different zone — elevation and distance from water change winter lows quickly.
Questions about 92066
What planting zone is ZIP code 92066?
ZIP code 92066 (Ranchita, CA) is in USDA hardiness zone 9a on the 2023 map: the coldest night of an average winter reaches 20 to 25 °F (−6.7 to −3.9 °C).
How much rain and snow does 92066 get?
About 5.2 inches of precipitation a year (NOAA 1991–2020 normals, Borrego Desert Park station).
How hot do summers get in Ranchita, CA?
The average high peaks at 107 °F in July, with about 177 days a year at 90 °F or more.
What kind of soil does 92066 have?
The USDA soil survey maps Calpine at the center of ZIP 92066: coarse sandy loam, well drained, pH about 6.5 (neutral).
Did spring come early in Ranchita, CA in 2026?
Spring leaf-out near 92066 came on Jan 24 in 2026, 11 days earlier than the 1991–2020 average (Feb 4), according to the USA National Phenology Network Spring Index.
What kind of onions grow in Ranchita, CA?
Intermediate onions: the longest day near 92066 is 14 h 21 min, so day-neutral types bulb best; long-day varieties may not bulb fully.
Did the zone for 92066 change?
Yes. The 2012 USDA map put 92066 in zone 8b; the 2023 map puts it in zone 9a. The newer map uses 1991–2020 data and more weather stations.