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

Planting zone for 92023 — Encinitas, CA

ZIP code 92023 (Encinitas, San Diego County) is in USDA zone 10a: the coldest winter night averages 30 to 35 °F.

Where ZIP 92023 is

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.

Zone10a30 to 35 °F
Coldest night−1.1 to 1.7 °C
Last frostrare
First frostrare
2012 zone10a

Same zone as on the 2012 map. 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 Service

Loading the forecast for Encinitas, 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 Rancho Bernardo, CA — 12 miles away, elevation 689 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 92023 came on Jan 19 — 4 days earlier than the 1991–2020 average (Jan 23).

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 Encinitas, CA

The soil mapped at the center of ZIP 92023 is Marina — loamy coarse sand, somewhat excessively drained.

TextureLoamy coarse sanddrains and warms fast; dries out and needs more feeding
pH6.5neutral; most vegetables like 6.0–7.0
DrainageSomewhat excessively drainednatural drainage class
Organic matter0.75%low — add compost
Hydrologic groupBwater soaks in moderately
Farmland classPrime farmland if irrigatedUSDA classification

Map unit: Marina loamy coarse sand, 2 to 9 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 92023; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Encinitas, CA

Summer high76 °Faverage high, August
Winter low47 °Faverage low, December
Hot days3days a year at 90 °F or more
Freezing nights0nights a year at 32 °F or less
Growing degree days4,583base 50 °F — the season’s usable heat
Longest day14 h 20 mindaylight on June 21
Shortest day9 h 58 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation12.1 inper year, rain and melted snow

Average high and low, by month

40°50°60°70°80°90°January: average high 65 °F, low 48 °F 65°48° JanFebruary: average high 64 °F, low 49 °F 64°49° FebMarch: average high 65 °F, low 51 °F 65°51° MarApril: average high 66 °F, low 53 °F 66°53° AprMay: average high 68 °F, low 57 °F 68°57° MayJune: average high 70 °F, low 60 °F 70°60° JunJuly: average high 74 °F, low 64 °F 74°64° JulAugust: average high 76 °F, low 65 °F 76°65° AugSeptember: average high 76 °F, low 64 °F 76°64° SepOctober: average high 73 °F, low 59 °F 73°59° OctNovember: average high 70 °F, low 52 °F 70°52° NovDecember: average high 65 °F, low 47 °F 65°47° Dec

Precipitation by month inches

0″1″2″3″January: 2.45 in precipitation 2.5 JanFebruary: 2.80 in precipitation 2.8 FebMarch: 1.83 in precipitation 1.8 MarApril: 0.98 in precipitation 1.0 AprMay: 0.32 in precipitation 0.3 MayJune: 0.08 in precipitation 0.1 JunJuly: 0.09 in precipitation 0.1 JulAugust: 0.03 in precipitation 0.0 AugSeptember: 0.13 in precipitation 0.1 SepOctober: 0.63 in precipitation 0.6 OctNovember: 0.99 in precipitation 1.0 NovDecember: 1.76 in precipitation 1.8 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Carlsbad Palomar Airport, CA (6 mi away); precipitation: Cardiff By The Sea 0.2 E, CA (within 1 mile). Daylight is calculated from latitude.

Nearby ZIP codes

4 of the 8 nearest ZIP codes are in a different zone — elevation and distance from water change winter lows quickly.

9200710b
Cardiff By The Sea, CA · 1 mi
9202410a
Encinitas, CA · 2 mi
9207510b
Solana Beach, CA · 3 mi
9200910a
Carlsbad, CA · 5 mi
9201110b
Carlsbad, CA · 5 mi
9201410b
Del Mar, CA · 6 mi
9206710a
Rancho Santa Fe, CA · 6 mi
9209110a
Rancho Santa Fe, CA · 6 mi

All 2 ZIP codes in Encinitas → · California planting zones →

Questions about 92023

What planting zone is ZIP code 92023?

ZIP code 92023 (Encinitas, 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 92023 get?

About 12.1 inches of precipitation a year (NOAA 1991–2020 normals, Cardiff By The Sea 0.2 E station).

How hot do summers get in Encinitas, CA?

The average high peaks at 76 °F in August, with about 3 days a year at 90 °F or more.

What kind of soil does 92023 have?

The USDA soil survey maps Marina at the center of ZIP 92023: loamy coarse sand, somewhat excessively drained, pH about 6.5 (neutral).

Did spring come early in Encinitas, CA in 2026?

Spring leaf-out near 92023 came on Jan 19 in 2026, 4 days earlier than the 1991–2020 average (Jan 23), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Encinitas, CA?

Intermediate onions: the longest day near 92023 is 14 h 20 min, so day-neutral types bulb best; long-day varieties may not bulb fully.