Planting zone for 92259 — Ocotillo, CA
ZIP code 92259 (Ocotillo, Imperial County) is in USDA zone 10a: the coldest winter night averages 30 to 35 °F.
Where ZIP 92259 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 9b 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 10a means →
Frost forecast — next 7 nights
live from the National Weather ServiceLoading the forecast for Ocotillo, 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 El Centro Naf, CA — 16 miles away, elevation -43 ft) the median growing season is 347 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 92259 came on Jan 17 — 5 days earlier than the 1991–2020 average (Jan 22).
Jan 222026
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 Ocotillo, CA
The soil mapped at the center of ZIP 92259 is Torriorthents — extremely gravelly sand, somewhat excessively drained.
Map unit: Torriorthents and Torripsamments; hyperthermic basins.
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 92259; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.
Climate in Ocotillo, CA
Average high and low, by month
Precipitation by month inches
NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: El Centro Naf, CA (16 mi away); precipitation: Ocotillo 2, CA (3 mi away). Daylight is calculated from latitude.
Nearby ZIP codes
2 of the 8 nearest ZIP codes are in a different zone — elevation and distance from water change winter lows quickly.
Questions about 92259
What planting zone is ZIP code 92259?
ZIP code 92259 (Ocotillo, CA) is in USDA hardiness zone 10a on the 2023 map: the coldest night of an average winter reaches 30 to 35 °F (−1.1 to 1.7 °C).
How much rain and snow does 92259 get?
About 3.5 inches of precipitation a year (NOAA 1991–2020 normals, Ocotillo 2 station).
How hot do summers get in Ocotillo, CA?
The average high peaks at 107 °F in July, with about 180 days a year at 90 °F or more.
What kind of soil does 92259 have?
The USDA soil survey maps Torriorthents at the center of ZIP 92259: extremely gravelly sand, somewhat excessively drained, pH about 8.0 (alkaline).
Did spring come early in Ocotillo, CA in 2026?
Spring leaf-out near 92259 came on Jan 17 in 2026, 5 days earlier than the 1991–2020 average (Jan 22), according to the USA National Phenology Network Spring Index.
What kind of onions grow in Ocotillo, CA?
Intermediate onions: the longest day near 92259 is 14 h 18 min, so day-neutral types bulb best; long-day varieties may not bulb fully.
Did the zone for 92259 change?
Yes. The 2012 USDA map put 92259 in zone 9b; the 2023 map puts it in zone 10a. The newer map uses 1991–2020 data and more weather stations.