ZIP code · Roundup · Montana · United States
ZIP code 59073 — Roundup
ZIP code 59073 serves Roundup, Montana.
- Postal code
- 59073Single source Value from one source, not cross-checked.
- City
- Roundup
- County
- Musselshell
- State
- Montana
- Country
- United States
- Coordinates
- 46.4452, -108.5418 — 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 59073 with another ZIP · ZIPs within 25 miles · distance from 59073
Climate — monthly normals
Warmest month Jul (avg high 89°F), coldest Jan (avg low 13°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 37 | 41 | 51 | 60 | 69 | 78 | 89 | 88 | 77 | 61 | 47 | 37 |
| Avg low °F | 13 | 15 | 22 | 30 | 39 | 48 | 54 | 51 | 42 | 32 | 22 | 14 |
| Precip in | 0.4 | 0.4 | 0.7 | 1.7 | 2.5 | 2.9 | 1.7 | 1.2 | 1.2 | 1.2 | 0.5 | 0.4 |
NOAA 1991–2020 climate normals from the nearest station: ROUNDUP (0.7 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