Off-grid site report

Flathead County, MT

47.9750, -114.1823 · 3,028 ft elevation
Read this before you act on anything below. This is my researched starting point for Flathead 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 rulesFlathead County, MT

Zoning & raw-land occupancy
Varies locallyFlathead County Planning & Zoning covers unincorporated areas with countywide zoning adopted in 1993, but some valley areas remain unzoned; separate Buildings for Lease or Rent rules apply in unzoned areas and the Scenic Corridor zone. Cities like Kalispell and Whitefish handle their own planning inside city limits. source
Dwellings, tiny homes & RVs
Unclear - verifyNo Flathead County-specific rule on tiny homes or RVs as permanent dwellings was found; this likely defaults to zoning definitions and the state building code baseline. Confirm directly with county Planning & Zoning. source
Building permits & codes
Varies locallyFlathead County does not operate a building department, so most residential construction does not need a county building permit, but site plan review is required first in certain zones (BS, BR-4, HO, I-1H, part of WV), and the state (Montana DLI Building Codes Bureau) still issues permits for certain construction types and all electrical work. source
Septic & composting toilets
Generally allowedThe Flathead City-County Health Department's Environmental Health program permits septic systems and requires licensed installers; permits have expiration windows tied to approval, payment, and installation. Composting toilets are not addressed in any official source found. source
Greywater reuse
RestrictedNo Flathead County-specific greywater rule was found; the Montana state rule barring greywater irrigation of human food crops applies by default under state law.
Rainwater harvesting
Generally allowedNo Flathead County ordinance restricting rainwater harvesting was found; general state guidance applies, and large-volume systems may interact with DNRC water rights review. source
Private wells & water rights
Varies locallyThe Flathead City-County Health Department recommends getting septic approval before drilling a well, and Montana DNRC issues water rights for wells when municipal water isn't available; floodplain wells need added DNRC/Army Corps permitting. source
Living disconnected from utilities
Unclear - verifyNo Flathead County source requires grid electrical connection, but the county does not issue certificates of occupancy and instead directs all new residential construction to obtain state electrical permits through Montana DLI. source

Open the full county page with sources →

Sun30-year normals

Peak-sun hours, annual average
4.2 hrs/day
Worst month (sizes an off-grid array)
1.7 hrs/day
Yearly output per 1 kW of panels
1,172 kWh
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Weather1991-2020

Precipitation
20 in/yr
Snowfall
48 in/yr
Heating degree days
8,038 (severe)
Frost-free season
May 17 to Sep 20

How far help isstraight-line

Hospital
Logan Health Medical Center
17.8 mi
Fire station
Lakeside Fire Station
3.9 mi
Hardware store
Ace Hardware
16.9 mi
Grocery
Blacktail Family Foods
3.5 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 59922).

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.