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

Planting zone for 93448 — Pismo Beach, CA

ZIP code 93448 (Pismo Beach, San Luis Obispo County) is in USDA zone 10a: the coldest winter night averages 30 to 35 °F.

Where ZIP 93448 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 Pismo Beach, 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 Pismo Beach, CA — 2 miles away, elevation 39 ft) the median growing season is 362 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 93448 came on Jan 22 — about the same time as the 1991–2020 average (Jan 24).

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 Pismo Beach, CA

The soil mapped at the center of ZIP 93448 is Still — gravelly sandy clay loam, well drained.

TextureGravelly sandy clay loamholds water and nutrients; slow to drain and warm up
pH6.7neutral; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter2.5%moderate
Hydrologic groupCwater soaks in slowly
Farmland classPrime farmland if irrigatedUSDA classification

Map unit: Still gravelly sandy clay loam, 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 93448; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Pismo Beach, CA

Summer high73 °Faverage high, October
Winter low44 °Faverage low, January
Hot days4days a year at 90 °F or more
Freezing nights2nights a year at 32 °F or less
Growing degree days3,364base 50 °F — the season’s usable heat
Longest day14 h 32 mindaylight on June 21
Shortest day9 h 47 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation17.9 inper year, rain and melted snow

Average high and low, by month

30°40°50°60°70°80°32 °FJanuary: average high 65 °F, low 44 °F 65°44° JanFebruary: average high 65 °F, low 44 °F 65°44° FebMarch: average high 68 °F, low 46 °F 68°46° MarApril: average high 70 °F, low 48 °F 70°48° AprMay: average high 72 °F, low 50 °F 72°50° MayJune: average high 71 °F, low 51 °F 71°51° JunJuly: average high 70 °F, low 54 °F 70°54° JulAugust: average high 71 °F, low 55 °F 71°55° AugSeptember: average high 72 °F, low 54 °F 72°54° SepOctober: average high 73 °F, low 53 °F 73°53° OctNovember: average high 69 °F, low 46 °F 69°46° NovDecember: average high 65 °F, low 44 °F 65°44° Dec

Precipitation by month inches

0″1″2″3″4″January: 3.48 in precipitation 3.5 JanFebruary: 4.00 in precipitation 4.0 FebMarch: 2.98 in precipitation 3.0 MarApril: 1.00 in precipitation 1.0 AprMay: 0.46 in precipitation 0.5 MayJune: 0.15 in precipitation 0.1 JunJuly: 0.02 in precipitation 0.0 JulAugust: 0.02 in precipitation 0.0 AugSeptember: 0.08 in precipitation 0.1 SepOctober: 0.79 in precipitation 0.8 OctNovember: 1.81 in precipitation 1.8 NovDecember: 3.08 in precipitation 3.1 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Pismo Beach, CA (2 mi away); precipitation: Pismo Beach, CA (2 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.

9344910a
Pismo Beach, CA · 1 mi
9348310a
Grover Beach, CA · 2 mi
9343310a
Grover Beach, CA · 2 mi
9347510a
Oceano, CA · 3 mi
934019b
San Luis Obispo, CA · 7 mi
9344510a
Oceano, CA · 7 mi
9342410a
Avila Beach, CA · 9 mi
934209b
Arroyo Grande, CA · 10 mi

All 2 ZIP codes in Pismo Beach → · California planting zones →

Questions about 93448

What planting zone is ZIP code 93448?

ZIP code 93448 (Pismo Beach, 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 93448 get?

About 17.9 inches of precipitation a year (NOAA 1991–2020 normals, Pismo Beach station).

How hot do summers get in Pismo Beach, CA?

The average high peaks at 73 °F in October, with about 4 days a year at 90 °F or more.

What kind of soil does 93448 have?

The USDA soil survey maps Still at the center of ZIP 93448: gravelly sandy clay loam, well drained, pH about 6.7 (neutral).

Did spring come early in Pismo Beach, CA in 2026?

Spring leaf-out near 93448 came on Jan 22 in 2026, about the same as the 1991–2020 average (Jan 24), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Pismo Beach, CA?

Intermediate onions: the longest day near 93448 is 14 h 32 min, so day-neutral types bulb best; long-day varieties may not bulb fully.