Off-grid site report

Musselshell County, MT

46.5048, -108.0972 · 3,084 ft elevation
Read this before you act on anything below. This is my researched starting point for Musselshell County, MT, not legal advice and not a guarantee. Rules change, and the deciding facts on any specific parcel (setbacks, perc results, overlay districts, deed restrictions, road frontage) live at the county or town office, not in any database. Before you buy land or build, confirm the current rules directly with the local zoning and health offices - the sources on this page tell you exactly who to call.

The local rulesMusselshell County, MT

Zoning & raw-land occupancy
Unclear - verifyNo adopted Musselshell County zoning resolution was found for unincorporated land; a Planning Board exists but its regulations weren't located online. Roundup city limits have separate municipal zoning. Confirm with the Planning Board.
Dwellings, tiny homes & RVs
Unclear - verifyNo county-specific rule on tiny homes or RVs was found; Montana's state baseline (IRC Appendix Q, RVs as vehicles) likely applies by default but this is not confirmed for the county.
Building permits & codes
Unclear - verifyNo evidence Musselshell County has adopted the state building code for single-family homes; not all Montana counties require permits. Confirm directly with the county. source
Septic & composting toilets
Generally allowedMusselshell County uses contract sanitarians for septic permitting and subdivision review, operating under Montana DEQ's statewide on-site wastewater standards.
Greywater reuse
RestrictedNo county-specific greywater rule found; the Montana state baseline (indoor reuse generally allowed without permit through a compliant system, subsurface irrigation more restricted) applies by default. Confirm with the county sanitarian.
Rainwater harvesting
Generally allowedNo Musselshell County ordinance restricts rooftop rainwater collection for personal non-potable use; the state baseline applies, with larger appropriations falling under DNRC's water rights process.
Private wells & water rights
Generally allowedMusselshell County falls under DNRC's Lewistown Water Resources Regional Office; exempt wells (10 acre-feet/year or less, 35 gpm or less) need either a beneficial use permit or groundwater certificate. Starting January 1, 2026, a Notice of Intent must be filed before using water under the permit exception. source
Living disconnected from utilities
Unclear - verifyNo official Musselshell County source addresses mandatory grid utility connection; subdivision or health rules could indirectly require an approved septic and water source. Confirm with the county sanitarian and planning offices.

Open the full county page with sources →

Sun30-year normals

Peak-sun hours, annual average
4.7 hrs/day
Worst month (sizes an off-grid array)
2.6 hrs/day
Yearly output per 1 kW of panels
1,347 kWh
JFMAMJJASOND

Weather1991-2020

Precipitation
15 in/yr
Snowfall
45 in/yr
Heating degree days
6,843 (cold)
Frost-free season
May 12 to Sep 27

How far help isstraight-line

Hospital
Roundup Memorial Healthcare
21.6 mi
Fire station
Musselshell Fire Department
1.0 mi
Hardware store
none within range
Grocery
Van Dyke's Food
21.5 mi

From OpenStreetMap. Road miles will be longer, often much longer in hill country.

Plan this spot

These open with this location's real numbers already filled in (ZIP 59059).

Size a solar systemHeat loss & insulationFirewood per winterRainwater harvestGarden sizePanel tilt

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Sources: US Census Bureau geocoder; NLR PVWatts v8 (solar); NOAA NCEI 1991-2020 climate normals (nearest station) or Open-Meteo (ZIP-centroid) for weather; Open-Elevation; OpenStreetMap contributors. Public data retrieved Aug 21, 2026; agencies update their layers on their own schedules. Planning data, not a survey or legal advice.