ZIP code · Helena · Montana · United States
ZIP code 59604 — Helena
ZIP code 59604 serves Helena, Montana.
- Postal code
- 59604Single source Value from one source, not cross-checked.
- City
- Helena
- County
- Lewis and Clark
- State
- Montana
- Country
- United States
- Coordinates
- 46.6672, -111.9689 — precision precise (locality)
View on OpenStreetMap - USDA hardiness zone
- 4b (-25 to -20 °F)Planting / growing zone from the 2023 USDA Plant Hardiness Zone Map: average annual extreme minimum temperature, 1991–2020.
- Time zone
- America/Denver (UTC−7 / UTC−6 DST)
- Area code
- 406Telephone 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 59604 with another ZIP · ZIPs within 25 miles · distance from 59604
Climate — monthly normals
Warmest month Jul (avg high 86°F), coldest Jan (avg low 14°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 32 | 37 | 48 | 57 | 66 | 75 | 86 | 85 | 73 | 58 | 43 | 33 |
| Avg low °F | 14 | 17 | 25 | 32 | 42 | 49 | 55 | 53 | 45 | 34 | 23 | 14 |
| Precip in | 0.4 | 0.4 | 0.5 | 1.0 | 1.9 | 2.2 | 1.1 | 1.0 | 1.0 | 0.8 | 0.6 | 0.5 |
NOAA 1991–2020 climate normals from the nearest station: HELENA RGNL AP (4.3 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