Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated Oct 29, 2026

Planting zone for El Sobrante, CA

El Sobrante, CA is in USDA zones 9b to 10a across its 2 ZIP codes.

El Sobrante on the zone map

Outlined: its 1 ZIP code areas · 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.

Zones9b–10a25 to 35 °F

ZIP codes2

Last frostrare

First frostrare

Growing seasonall year

9b 1 ZIP 10a 1 ZIP

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for El Sobrante, 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 Richmond, CA, elevation 20 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 94820 came on Jan 29 — about the same time as the 1991–2020 average (Jan 28).

average
Jan 282026
Jan 29

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 El Sobrante, CA

The soil mapped at the center of ZIP 94820 is Los Osos — clay loam, well drained.

TextureClay loamholds water and nutrients; slow to drain and warm up

pH6.5neutral; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter3%moderate

Hydrologic groupDwater soaks in very slowly

Farmland classNot prime farmlandUSDA classification

Map unit: Cut and fill land-Los Osos complex, 9 to 30 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 94820; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in El Sobrante, CA

Summer high75 °Faverage high, September

Winter low44 °Faverage low, January

Hot days5days a year at 90 °F or more

Freezing nights0nights a year at 32 °F or less

Growing degree days3,322base 50 °F — the season’s usable heat

Longest day14 h 48 mindaylight on June 21

Shortest day9 h 32 mindaylight on December 21

Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully

Precipitation24.2 inper year, rain and melted snow

Average high and low, by month

Precipitation by month inches

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Richmond, CA (6 mi away); precipitation: El Cerrito 1.3 Nw, CA (3 mi away). Daylight is calculated from latitude.