Off-grid site report

Gallatin County, MT

45.6909, -111.0579 · 4,764 ft elevation

Read this before you act on anything below. This is my researched starting point for Gallatin 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 rulesGallatin County, MT

Zoning & raw-land occupancy

Varies locallyGallatin County has no single zoning code; it administers 22 separate districts plus a Part 1 Administrative Regulation, and most construction needs a Land Use Permit from county Planning. Rules differ by district and by whether you're in Bozeman or Belgrade. source

Dwellings, tiny homes & RVs

Unclear - verifyNo county page specifically addresses tiny homes on wheels or RV living long-term; it depends on the applicable zoning sub-district's dwelling-unit definition plus Montana's state baseline. Confirm with county Planning for your parcel. source

Building permits & codes

Varies locallyGallatin County itself does not issue building permits; Bozeman and Belgrade issue their own within city limits, and the Montana Building Codes Bureau in Helena covers the rest of the unincorporated county. A separate county Land Use Permit for zoning is still required everywhere. source

Septic & composting toilets

Generally allowedThe Gallatin City-County Health Department's Environmental Health Services issues wastewater/septic permits based on state DEQ standards and site evaluation. Composting toilets specifically are not addressed on the pages found, so confirm directly with that office. source

Greywater reuse

Unclear - verifyNo Gallatin County-specific greywater page was found; it likely routes through the same wastewater permitting framework as septic under state rules, but this isn't confirmed locally. Ask Environmental Health Services directly.

Rainwater harvesting

Unclear - verifyNo county or health department page addressing rainwater harvesting was found, so this isn't confirmed at the local level; it presumably follows Montana's general baseline allowing basic rooftop collection.

Private wells & water rights

Varies locallyGallatin County directs residents to Environmental Health before drilling, and a Montana DNRC permit is required if the parcel sits in a Controlled Groundwater Area; wells should be filed with DNRC regardless. Part of the Gallatin River Basin is also closed to new surface-water appropriations, a notable local variance from the state's general allowance. source

Living disconnected from utilities

Varies locallyNo ordinance was found requiring grid electric connection for a single-family home, but if a parcel lies within a designated water and sewer district, connecting to that system is mandatory regardless of off-grid intent.

Open the full county page with sources →

Sun30-year normals

Peak-sun hours, annual average: 4.5 hrs/day
Worst month (sizes an off-grid array): 2.1 hrs/day
Yearly output per 1 kW of panels: 1,267 kWh

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Weather1991-2020

Precipitation: 16 in/yr
Snowfall: 50 in/yr
Heating degree days: 7,815 (severe)
Frost-free season: May 31 to Sep 16

How far help isstraight-line

Hospital Bozeman Deaconess Hospital: 2.3 mi
Fire station Bozeman Fire Department Station 2: 1.1 mi
Hardware store Kenyon Noble Hardware: 0.3 mi
Grocery Smith's: 0.3 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 59715).

Size a solar system Heat loss & insulation Firewood per winter Rainwater harvest Garden size Panel tilt

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.