Solar Energy in Yellowstone County, MT (2026)

1 county-level rule, plus city-specific rules for 1 city in Yellowstone County, Montana.

Verified from official government sources

Note: These county rules apply to unincorporated areas of Yellowstone County. If you live within an incorporated city, that city's own rules apply: see the city list below.

Panel Permits

In unincorporated Yellowstone County, Montana, a rooftop or ground-mounted solar array is regulated as a Solar Energy Facility (SEF) under three size tiers. Tier 1 accessory systems serving one property face the lightest review, while Tier 2 intermediate and Tier 3 large-scale SEFs need a zoning compliance permit or special review that includes a landscape plan, a stormwater management plan, a maintenance plan, and a decommissioning plan.

Solar Panel Permit Rules in Yellowstone County

Some Restrictions

Yellowstone County Zoning Code § 27-1007.B.5

5. Permit Required (a) The following permit requirements are applicable to SEF systems. Complete permit submission requirements and processes are provided in Section 27-1600. (b) Submission Requirements for Tier 2 and Tier 3 SEFs: Tier 2 zoning compliance permit and Tier 3 special review SEF applications shall include the following information: (1) A landscape plan showing that all areas occupi...

Full ordinance details →Official source ↗

Solar Energy by City in Yellowstone County

1 cities in Yellowstone County have their own solar energy rules. Each link goes to that city's dedicated page with code citations.

BillingsPop. 117,116

1 verified rule • Panel Permits

All Yellowstone County ordinances

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