Garden Climate for Poway & San Diego: 92064, 92128
Zone 10a · Last frost ~Feb 2 · Soil 72.1°F today (measured) · See your place on the 2023 USDA zone map
ZIPs in this area
What differs between these ZIPs: elevation. Everything else on this page is the same for all of them. The page below shows 92128 (closest to the area's middle elevation).
| ZIP | Town | Elevation | Zone | Last frost | First frost | Chill hrs last season | Soil now |
|---|---|---|---|---|---|---|---|
| 92064 | Poway | 555 ft | 10a | Feb 2 | Dec 7 | 536 | 72.1°F |
| 92128 | San Diego | 746 ft | 10a | Feb 2 | Dec 7 | 536 | 72.1°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: median last frost dates within about two weeks of each other, last season's chill hours all in the 300-600 range, the same inland 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 92128
Earliest-risk fall date (10%): Nov 22.
Station record: 19 of the 30 years in 1991–2020, which NOAA still uses for freeze dates. A full record would be more reliable.
NOAA NCEI U.S. Climate Normals 1991-2020, annual/seasonal freeze probabilities (32F) · CA SAN PASQUAL ANIMAL PK (USC00047874) 11.9 km away 19 yrs of record · 325 ft lower than this ZIP
Newsletter · 92128
Frost alerts and planting reminders for 92128. 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 · 92128
Calendar: San Diego County, inland valleys (guide Regions 3-4). 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 92128
What USDA hardiness zone is 92128?
ZIP 92128 (San Diego, CA) is in USDA zone 10a (30 to 35°F average annual extreme minimum), per the 2023 USDA Plant Hardiness Zone Map.
When is the last frost in 92128?
Based on NOAA 1991–2020 normals at Ca San Pasqual Animal Pk (11.9 km away), the median last 32°F freeze is Feb 2. In 1 of 10 years it is after Mar 4. The median first fall freeze is Dec 7.
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 PASQUAL ANIMAL PK (USC00047874) 11.9 km away 19 yrs of record · 325 ft lower than this ZIP
- Forecast: NOAA National Weather Service api.weather.gov (7-day forecast + gridpoint wind gusts)
- Soil: NOAA U.S. Climate Reference Network (USCRN) hourly02, SOIL_TEMP_10
- Chill: CIMIS, California Department of Water Resources (hourly air temperature; QC-flagged hours dropped)
- Raw data: /data/zip/92128.json