Planting zone for 92179 — San Diego, CA
ZIP code 92179 (San Diego, San Diego County) is in USDA zone 10b: the coldest winter night averages 35 to 40 °F.
Where ZIP 92179 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 Diego, 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 San Diego Brown Field, CA — 2 miles away, elevation 515 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 92179 came on Jan 17 — 6 days earlier than the 1991–2020 average (Jan 23).
Jan 232026
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 Diego, CA
The soil mapped at the center of ZIP 92179 is Stockpen — gravelly clay loam, moderately well drained.
Map unit: Stockpen gravelly clay loam, 0 to 2 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 92179; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.
Climate in San Diego, CA
Average high and low, by month
Precipitation by month inches
NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: San Diego Brown Field, CA (2 mi away); precipitation: San Diego Brown Field, CA (2 mi away). Daylight is calculated from latitude.
Nearby ZIP codes
All 8 nearest ZIP codes share zone 10b.
All 73 ZIP codes in San Diego → · California planting zones →
Questions about 92179
What planting zone is ZIP code 92179?
ZIP code 92179 (San Diego, 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 92179 get?
About 10.2 inches of precipitation a year (NOAA 1991–2020 normals, San Diego Brown Field station).
How hot do summers get in San Diego, CA?
The average high peaks at 81 °F in August, with about 13 days a year at 90 °F or more.
What kind of soil does 92179 have?
The USDA soil survey maps Stockpen at the center of ZIP 92179: gravelly clay loam, moderately well drained, pH about 6.1 (slightly acidic).
Did spring come early in San Diego, CA in 2026?
Spring leaf-out near 92179 came on Jan 17 in 2026, 6 days earlier than the 1991–2020 average (Jan 23), according to the USA National Phenology Network Spring Index.
What kind of onions grow in San Diego, CA?
Short-day onions: the longest day near 92179 is 14 h 18 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.
Did the zone for 92179 change?
Yes. The 2012 USDA map put 92179 in zone 10a; the 2023 map puts it in zone 10b. The newer map uses 1991–2020 data and more weather stations.