Planting zone for 92036 — Julian, CA
ZIP code 92036 (Julian, San Diego County) is in USDA zone 9b: the coldest winter night averages 25 to 30 °F.
Where ZIP 92036 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 — a full 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 Julian, 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 Ocotillo Wells 2w, CA — 10 miles away, elevation 390 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 92036 came on Jan 24 — 4 days earlier than the 1991–2020 average (Jan 28).
Jan 282026
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 Julian, CA
The soil mapped at the center of ZIP 92036 is Typic Haplocalcids — gravelly coarse sand, somewhat excessively drained.
Map unit: Typic Haplocalcids-Typic Petrocalcids-Typic Torriorthents, rarely flooded complex, 5 to 40 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 92036; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.
Climate in Julian, CA
Average high and low, by month
Precipitation by month inches
NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Ocotillo Wells 2w, CA (10 mi away); precipitation: Ocotillo Wells 2w, CA (10 mi away). Daylight is calculated from latitude.
Nearby ZIP codes
7 of the 8 nearest ZIP codes are in a different zone — elevation and distance from water change winter lows quickly.
Questions about 92036
What planting zone is ZIP code 92036?
ZIP code 92036 (Julian, 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 92036 get?
About 4 inches of precipitation a year (NOAA 1991–2020 normals, Ocotillo Wells 2w station).
How hot do summers get in Julian, CA?
The average high peaks at 108 °F in July, with about 182 days a year at 90 °F or more.
What kind of soil does 92036 have?
The USDA soil survey maps Typic Haplocalcids at the center of ZIP 92036: gravelly coarse sand, somewhat excessively drained, pH about 8.0 (alkaline).
Did spring come early in Julian, CA in 2026?
Spring leaf-out near 92036 came on Jan 24 in 2026, 4 days earlier than the 1991–2020 average (Jan 28), according to the USA National Phenology Network Spring Index.
What kind of onions grow in Julian, CA?
Intermediate onions: the longest day near 92036 is 14 h 20 min, so day-neutral types bulb best; long-day varieties may not bulb fully.
Did the zone for 92036 change?
Yes. The 2012 USDA map put 92036 in zone 8b; the 2023 map puts it in zone 9b. The newer map uses 1991–2020 data and more weather stations.