Off-grid site report

Cascade County, MT

47.2711, -111.7005 · 3,393 ft elevation

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

Zoning & raw-land occupancy

RestrictedCascade County adopted its own Zoning Regulations in 2007, requiring a Location/Conformance permit from the Planning & GIS Department for structures and land-use changes; rules vary by zoning district within the county. source

Dwellings, tiny homes & RVs

Unclear - verifyNo official county page specifically addresses tiny homes on wheels or RVs as permanent dwellings; the zoning code defines a general 'living unit' standard. Confirm with Cascade County Planning & GIS. source

Building permits & codes

Varies locallyCascade County does not enforce its own building code; the state's Building Codes Program under Montana DLI's Business Standards Division handles permits/inspections in unincorporated areas. source

Septic & composting toilets

Generally allowedThe Cascade City-County Health Department's Environmental Health division permits septic systems under Montana DEQ standards, and self-installation is allowed with extra oversight; zoning approval from Planning is required first. source

Greywater reuse

Unclear - verifyNo Cascade County-specific greywater ordinance was found; wastewater generally falls under the county's DEQ-derived septic rules but greywater reuse isn't separately addressed. Ask Environmental Health. source

Rainwater harvesting

Unclear - verifyNo Cascade County ordinance on rooftop rainwater collection was found in official sources; not confirmed as regulated or prohibited.

Private wells & water rights

Generally allowedPrivate wells are governed by Montana DNRC's exempt-well framework statewide (35 gpm or less, under 10 acre-feet/year), not by a distinct Cascade County rule; a Notice of Intent will be required starting in 2026. source

Living disconnected from utilities

Unclear - verifyNo Cascade County statute explicitly requires grid or municipal utility connection for a private home, but off-grid setups still must pass separate zoning and septic approvals.

Open the full county page with sources →

Sun30-year normals

Peak-sun hours, annual average: 4.8 hrs/day
Worst month (sizes an off-grid array): 2.6 hrs/day
Yearly output per 1 kW of panels: 1,389 kWh

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Weather1991-2020

Precipitation: 17 in/yr
Snowfall: 69 in/yr
Heating degree days: 7,027 (cold)
Frost-free season: May 24 to Sep 15

How far help isstraight-line

Hospital Benefis East: 25.5 mi
Fire station Cascade Volunteer Fire Department: 0.0 mi
Hardware store The Home Depot: 22.2 mi
Grocery 468 Market: 0.1 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 59421).

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.