ZIP code · Palo Alto · California · United States

ZIP code 94309 — Palo Alto

ZIP code 94309 serves Palo Alto, California.

Postal code: 94309
Single source Value from one source, not cross-checked.
City: Palo Alto
County: Santa Clara
State: California
Country: United States
Coordinates: 37.4419, -122.1430 — 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: 650
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 94309 with another ZIP · ZIPs within 25 miles · distance from 94309

Climate — monthly normals

Warmest month Sep (avg high 80°F), coldest Dec (avg low 39°F).

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high °F	58	61	66	70	73	79	79	79	80	74	64	58
Avg low °F	39	41	44	45	50	53	56	55	53	48	43	39
Precip in	3.0	3.2	2.2	1.0	0.4	0.1	0.0	0.0	0.1	0.6	1.6	3.0

NOAA 1991–2020 climate normals from the nearest station: PALO ALTO (0.2 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