ZIP code · Alpine · California · United States

ZIP code 91903 — Alpine

ZIP code 91903 serves Alpine, California.

Postal code: 91903
Single source Value from one source, not cross-checked.
City: Alpine
County: San Diego
State: California
Country: United States
Coordinates: 32.8351, -116.7664 — precision precise (locality)
View on OpenStreetMap
USDA hardiness zone: 9b (25 to 30 °F)
Planting / growing zone from the 2023 USDA Plant Hardiness Zone Map: average annual extreme minimum temperature, 1991–2020.
Time zone: America/Los_Angeles (UTC−8 / UTC−7 DST)
Area code: 530
Telephone area codes serving this ZIP (NANPA central-office assignments). A ZIP and an area code are different boundaries; at a border both codes may apply.

Tools: compare 91903 with another ZIP · ZIPs within 25 miles · distance from 91903

Climate — monthly normals

Warmest month Aug (avg high 89°F), coldest Dec (avg low 42°F).

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high °F	64	64	67	71	74	81	87	89	86	78	71	63
Avg low °F	43	42	44	47	51	54	60	62	60	54	48	42
Precip in	3.2	3.6	2.7	1.2	0.6	0.1	0.1	0.1	0.3	0.6	1.5	2.0

NOAA 1991–2020 climate normals from the nearest station: ALPINE (0.6 mi) · NOAA NCEI

About this page

US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.

GeoNames · NOAA NCEI · usda-phzm. Data generated on 2026-08-21. Methodology · Report an error on this page