Three Forks Airport (9S5), Montana
Landing essentials
Whether you can land, whether you can refuel, and how customs works here.
Overview
Three Forks Airport (9S5) is a public-use, non-towered field in southwestern Montana, roughly 21 nm from the nearest metro area. Business aviation traffic is minimal, with FAA TFMSC recording 21 operations for 2025.
Runways
Three Forks Airport has one paved runway, 03/21, 5,099 ft long and 60 ft wide, with an asphalt surface.
Source: FAA Form 5010.
Fuel and airfield services
Three Forks Airport has 100LL available on the field. Fueling is available 24 hours a day, every day, and the airport has no control tower.
Source: FAA Form 5010 / NASR.
Customs
Three Forks Airport does not clear customs. The nearest port of entry is Bozeman Yellowstone International (KBZN), 19 NM away.
Source: CBP list of ports of entry.
Business aviation traffic
Three Forks Airport recorded 21 business aviation movements in 2025. Traffic peaks in July. Business aviation traffic at Three Forks (9S5) concentrates in the summer months, with July showing the highest count of the year.
Business jet movements, FAA TFMSC count. Peak month July, 5 movements in 2025.
Source: FAA TFMSC, business jet movements, 2025.
Climate
Three Forks Airport averages 11.3 days above 90°F in July and 29.5 freeze days in January. July is the warmest month, with average highs of 84.7°F, and December the coldest, at 32.9°F.
Weather station is 5.7 NM from the field. Some values are estimated by the agency. 1991–2020 climate normals.
Source: NOAA NCEI.
Operating constraints
Three Forks Airport has published operating constraints in three categories: access, runway notes and other notes.
For clearance delivery, contact Big Sky Approach; if unable, contact Salt Lake ARTCC.
Pilot-controlled REILs on runway 03 and 21, PAPI on runway 03 and 21, and MIRL on runway 03/21 are activated via CTAF.
Fuel is available 24 hours through a credit card self-service system.
Occasional aerobatic maneuvers occur in the vicinity of the airport.
On departure, all aircraft must reach 500 feet altitude before making any turns.
Source: FAA Chart Supplement.
Nearby airfields
Three Forks Airport has five airfields within 40 NM. The closest is Bozeman Yellowstone International (KBZN), 18.55 NM east.
Part of the Bozeman and Big Sky area.
Source: Skystar calculation from official coordinates.
Skystar at 9S5
We arrange catering, fuel and trip support here. Supplier prices reach you unchanged; our coordination fee sits on its own line.
The same order, priced two ways.
$600.00 catering order at 9S5.
Unchanged.
What the kitchen invoices us is what your quote reads.
One line, fixed.
The $75 minimum applies below $862.50.
At cost.
Passed on at the exact amount the processor took.
Market practice figures are industry averages, not a specific competitor.
Frequently asked questions
Is Jet A fuel available at 9S5 Three Forks?
No. Three Forks (9S5) stocks 100LL only, with no Jet A on field. The fuel is available through a 24-hour credit card self-service system, with no attendant hours restricting access.
Where is the nearest customs facility to Three Forks Airport?
The nearest customs airport to Three Forks (9S5) is Bozeman Yellowstone International (KBZN), about 18.55 nm away. Three Forks itself has no onsite customs service, so international arrivals must clear at KBZN.
What is the runway length at 9S5?
Three Forks (9S5) has a single paved runway, 03/21, measuring 5,099 feet by 60 feet with an asphalt surface. This is also listed as the airport's maximum paved runway length.