Planting zone for 92316 — Bloomington, CA
ZIP code 92316 (Bloomington, San Bernardino County) is in USDA zone 10a: the coldest winter night averages 30 to 35 °F.
Where ZIP 92316 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 Bloomington, 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 Riverside Citrus Exp, CA — 6 miles away, elevation 988 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 92316 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 Bloomington, CA
The soil mapped at the center of ZIP 92316 is Delhi — fine sand, somewhat excessively drained.
Map unit: Delhi fine sand.
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 92316; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.
Climate in Bloomington, CA
Average high and low, by month
Precipitation by month inches
NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Riverside Citrus Exp, CA (6 mi away); precipitation: Rialto 2.1 N, CA (6 mi away). Daylight is calculated from latitude.
Nearby ZIP codes
All 8 nearest ZIP codes share zone 10a.
Questions about 92316
What planting zone is ZIP code 92316?
ZIP code 92316 (Bloomington, 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 92316 get?
About 17.3 inches of precipitation a year (NOAA 1991–2020 normals, Rialto 2.1 N station).
How hot do summers get in Bloomington, CA?
The average high peaks at 97 °F in August, with about 103 days a year at 90 °F or more.
What kind of soil does 92316 have?
The USDA soil survey maps Delhi at the center of ZIP 92316: fine sand, somewhat excessively drained, pH about 6.5 (neutral).
Did spring come early in Bloomington, CA in 2026?
Spring leaf-out near 92316 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 Bloomington, CA?
Intermediate onions: the longest day near 92316 is 14 h 26 min, so day-neutral types bulb best; long-day varieties may not bulb fully.
Did the zone for 92316 change?
Yes. The 2012 USDA map put 92316 in zone 9b; the 2023 map puts it in zone 10a. The newer map uses 1991–2020 data and more weather stations.