Garden Climate for San Diego: 92121, 92122, 92130
Zone 10b · Frost-free in most years · Soil 69.8°F today (modeled) · See your place on the 2023 USDA zone map
ZIPs in this area
What differs between these ZIPs: elevation, soil temperature. Everything else on this page is the same for all of them. The page below shows 92122 (closest to the area's middle elevation).
| ZIP | Town | Elevation | Zone | Last frost | First frost | Chill hrs last season | Soil now |
|---|---|---|---|---|---|---|---|
| 92121 | San Diego | 194 ft | 10b | frost-free | frost-free | 150 | 72.1°F |
| 92122 | San Diego | 281 ft | 10b | frost-free | frost-free | 150 | 69.8°F |
| 92130 | San Diego | 333 ft | 10b | frost-free | frost-free | 150 | 69.5°F |
Why grouped: these are urban and suburban lowland ZIPs (under about 1,500 ft and within 40 km of the ocean) whose numbers are close: all frost-free in most years, last season's chill hours all in the 100-300 range, the same coastal setting and the same 820 ft elevation band. Each ZIP still uses its own nearest suitable stations; see the table for exact values.
Public NOAA/USDA data, updated 2026-10-16 18:57 UTC.
USDA Plant Hardiness Zone Map · San Diego focus
USDA Plant Hardiness Zone Map, 2023. Agricultural Research Service, U.S. Department of Agriculture. Accessed from https://planthardiness.ars.usda.gov/. Rendered unaltered from the PRISM Group, Oregon State University GIS data (https://prism.oregonstate.edu, accessed 15 Oct 2026) with official zone colors. Roads (TIGER/Line 2023 primary roads), place names (2023 Gazetteer) and state lines (2023 cartographic boundaries 1:500k) are drawn on top. Source: U.S. Census Bureau.
Frost dates for 92122
Frost-free in most years. No 32F freeze in at least 9 of 10 years at this station (NCEI reports no freeze dates; growing season = 365 days).
NOAA NCEI U.S. Climate Normals 1991-2020, annual/seasonal freeze probabilities (32F) · CA SAN DIEGO MIRAMAR NAS (USW00093107) 7.4 km away 24 yrs of record · 197 ft higher than this ZIP
Newsletter · 92122
Frost alerts and planting reminders for 92122. Coming soon.
7-day forecast · High / Low / Rain / Frost / Wind
NOAA NWS api.weather.gov (SGX). Frost = low ≤32°F · High wind = gust ≥40 mph · 💧 = chance of precipitation and expected amount (NWS quantitative precipitation forecast; blank when NWS gives none) · Rain = chance ≥50%.
What to grow when · 92122
Calendar: San Diego County, coastal (guide Regions 1-2). Planting months from UC Master Gardeners of San Diego County; Master Gardener Association of San Diego County. Harvest months add typical days-to-harvest. This month also checks live soil temperature and the 7-day frost forecast. The harvest planner uses the same calendar. Rules: methodology.
Questions about 92122
What USDA hardiness zone is 92122?
ZIP 92122 (San Diego, CA) is in USDA zone 10b (35 to 40°F average annual extreme minimum), per the 2023 USDA Plant Hardiness Zone Map.
When is the last frost in 92122?
The nearest NOAA normals station (Ca San Diego Miramar Nas, 7.4 km) records no 32°F freeze in at least 9 of 10 years (1991–2020).
Nearby ZIP codes
Sources for this page
- Location: US Census Bureau 2023 Gazetteer, ZCTA internal point
- Zone: USDA Plant Hardiness Zone Map 2023, ZIP datasets (USDA ARS + PRISM Climate Group, Oregon State University)
- Frost: NOAA NCEI U.S. Climate Normals 1991-2020, annual/seasonal freeze probabilities (32F) CA SAN DIEGO MIRAMAR NAS (USW00093107) 7.4 km away 24 yrs of record · 197 ft higher than this ZIP
- Forecast: NOAA National Weather Service api.weather.gov (7-day forecast + gridpoint wind gusts)
- Soil: Open-Meteo forecast API soil model (non-commercial terms)
- Chill: Iowa Environmental Mesonet ASOS archive (NWS/FAA METAR routine + special obs; one value per clock hour)
- Raw data: /data/zip/92122.json