Water
Montana follows prior appropriation, administered by the Department of Natural Resources and Conservation. Small groundwater developments are exempt from a permit: up to 35 gallons a minute and no more than 10 acre-feet a year, with a notice filed with the state. Beginning in 2026, a notice of intent is also required before use. Some controlled groundwater areas set tighter limits.
Building codes
Montana adopts a statewide code based on the 2021 International Codes. Cities and counties may enforce it only if the state certifies them. Outside certified jurisdictions, the state does not issue residential building permits, although homes must still meet the code and electrical and plumbing permits are still required. On any Montana site, we confirm the jurisdiction's status early and document our work to the code either way.
Climate and growing season
Montana spans zones 3a to 6b. Montana State University puts the frost-free season in the central Bitterroot Valley at about 120 days. Winters are long and cold, so heat, fuel storage and winter access shape every Montana design.
Hazards
In NOAA's billion-dollar disaster records for Montana, drought and wildfire dominate, followed by severe storms and flooding. Extreme cold and winter storms are a fact of life. Sites are chosen for fire-safe terrain and year-round access.
Our view
With about seven people per square mile, Montana offers distance that few states can match. Large ranch properties come up for sale, often to buyers paying cash. For a compound, the value is in the combination: private land, water rights that come with it, and a road that stays open in January.
This guide is general information, current to October 2026, and not legal, tax or water-rights advice. Water and building rules change and vary by county and basin. We verify every requirement for a specific parcel with the responsible agency before purchase.