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

Planting zone for 92058 — Oceanside, CA

ZIP code 92058 (Oceanside, San Diego County) is in USDA zone 10a: the coldest winter night averages 30 to 35 °F. The median last spring frost is February 16 and the first fall frost December 8.

Where ZIP 92058 is

Outlined: the ZIP code area · 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 frostFeb 16
First frostDec 8
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 Oceanside, 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 in Oceanside, CA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostFebruary 16median — 50% chance of a later frost
Safe for tender plantsMarch 18only 10% chance of frost after
First fall frostDecember 8median — 10% chance by Nov 21
Growing season298 daysfrost-free, median

A hard freeze (28 °F) usually ends around January 11 and returns around December 22.

From the NOAA station Camp Pendleton Mcas, CA — 2 miles away, elevation 75 ft. NOAA NCEI U.S. Climate Normals 1991–2020, 32 °F threshold. Low spots and valleys can freeze later in spring than the station.

When to plant vegetables in 92058

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Jan 5 – Jan 19
SpinachSow outdoors · Jan 5 – Jan 26
Broccoli, cabbageStart indoors · Dec 8 – Dec 22
Broccoli, cabbageTransplant · Jan 26 – Feb 9
Onion setsPlant outdoors · Jan 19 – Feb 2
PotatoesPlant outdoors · Jan 26 – Feb 9
LettuceSow outdoors · Jan 19 – Feb 2
Carrots, beetsSow outdoors · Jan 26 – Feb 9
TomatoesStart indoors · Dec 22 – Jan 5
TomatoesTransplant · Feb 23 – Mar 9
Peppers, eggplantStart indoors · Dec 8 – Dec 22
Peppers, eggplantTransplant · Mar 2 – Mar 16
BeansSow outdoors · Feb 23 – Mar 9
Sweet cornSow outdoors · Feb 23 – Mar 9
Cucumbers, squashSow outdoors · Feb 23 – Mar 9
Fall lettuce, spinachSow outdoors · Oct 13 – Oct 27
GarlicPlant cloves · Nov 24 – Dec 29
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Feb 16) and first fall frost (Dec 8) with the rules of thumb U.S. extension services publish. Cool-season crops take a light frost; warm-season crops do best once the soil is above about 60 °F.

When spring arrived in 2026

In 2026, spring leaf-out near 92058 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 Oceanside, CA

The soil mapped at the center of ZIP 92058 is Gaviota — fine sandy loam, well drained.

TextureFine sandy loamdrains and warms fast; dries out and needs more feeding
pH7.6slightly alkaline; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter0.75%low — add compost
Hydrologic groupDwater soaks in very slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Gaviota fine sandy loam, 30 to 50 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 92058; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Oceanside, CA

Summer high83 °Faverage high, August
Winter low39 °Faverage low, December
Hot days18days a year at 90 °F or more
Freezing nights15nights a year at 32 °F or less
Growing degree days4,531base 50 °F — the season’s usable heat
Longest day14 h 21 mindaylight on June 21
Shortest day9 h 57 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation11.9 inper year, rain and melted snow

Average high and low, by month

30°40°50°60°70°80°90°32 °FJanuary: average high 69 °F, low 40 °F 69°40° JanFebruary: average high 69 °F, low 41 °F 69°41° FebMarch: average high 69 °F, low 45 °F 69°45° MarApril: average high 72 °F, low 48 °F 72°48° AprMay: average high 72 °F, low 53 °F 72°53° MayJune: average high 76 °F, low 57 °F 76°57° JunJuly: average high 80 °F, low 60 °F 80°60° JulAugust: average high 83 °F, low 61 °F 83°61° AugSeptember: average high 83 °F, low 58 °F 83°58° SepOctober: average high 79 °F, low 52 °F 79°52° OctNovember: average high 75 °F, low 44 °F 75°44° NovDecember: average high 69 °F, low 39 °F 69°39° Dec

Precipitation by month inches

0″1″2″3″January: 2.37 in precipitation 2.4 JanFebruary: 2.90 in precipitation 2.9 FebMarch: 1.68 in precipitation 1.7 MarApril: 0.87 in precipitation 0.9 AprMay: 0.30 in precipitation 0.3 MayJune: 0.11 in precipitation 0.1 JunJuly: 0.05 in precipitation 0.1 JulAugust: 0.04 in precipitation 0.0 AugSeptember: 0.13 in precipitation 0.1 SepOctober: 0.64 in precipitation 0.6 OctNovember: 0.79 in precipitation 0.8 NovDecember: 1.98 in precipitation 2.0 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Camp Pendleton Mcas, CA (2 mi away); precipitation: Oceanside Municipal Airport, CA (3 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

920689b
San Luis Rey, CA · 3 mi
9205710a
Oceanside, CA · 4 mi
9205410a
Oceanside, CA · 5 mi
9204910a
Oceanside, CA · 5 mi
9205110a
Oceanside, CA · 5 mi
9205210a
Oceanside, CA · 5 mi
9205610a
Oceanside, CA · 5 mi
9208310a
Vista, CA · 7 mi

All 7 ZIP codes in Oceanside → · California planting zones →

Questions about 92058

What planting zone is ZIP code 92058?

ZIP code 92058 (Oceanside, 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).

When is the last frost in Oceanside, CA?

The median last spring frost (32 °F) near 92058 is February 16; after March 18 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Camp Pendleton Mcas station.

When is the first frost in Oceanside, CA?

The median first fall frost near 92058 is December 8, giving a median frost-free growing season of 298 days.

When should I plant tomatoes in 92058?

Start tomato seeds indoors around Dec 22 – Jan 5 and set transplants outside around Feb 23 – Mar 9, one to three weeks after the median last frost.

How much rain and snow does 92058 get?

About 11.9 inches of precipitation a year (NOAA 1991–2020 normals, Oceanside Municipal Airport station).

How hot do summers get in Oceanside, CA?

The average high peaks at 83 °F in August, with about 18 days a year at 90 °F or more.

What kind of soil does 92058 have?

The USDA soil survey maps Gaviota at the center of ZIP 92058: fine sandy loam, well drained, pH about 7.6 (slightly alkaline).

Did spring come early in Oceanside, CA in 2026?

Spring leaf-out near 92058 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 Oceanside, CA?

Intermediate onions: the longest day near 92058 is 14 h 21 min, so day-neutral types bulb best; long-day varieties may not bulb fully.