Three Forks, Montana
9S5 Three Forks
Three Forks (9S5) is a non-towered, public-use airport in Three Forks, Montana, at 4,089.4 ft MSL. Its runway is 03/21 (5,099 by 60 ft, asphalt). CTAF 122.8.
FAA NASR data effective Oct 29, 2026. Not for navigation; verify with current FAA charts and the Chart Supplement.
Airport
At a glance
- Identifiers
- FAA 9S5
- Location
- Three Forks, Montana (Gallatin County). 1 NM SE of the city center
- Elevation
- 4,089.4 ft MSL
- Position
- 45.8781° N, 111.5694° W
- Control tower
- No, non-towered
- Sectional chart
- Great Falls
- Magnetic variation
- 16° E (1985)
- Fuel
- 100LL
- Ownership
- Publicly owned, open to the public
- Attendance
- Daily ALL
1 runway
Runways
| Runway | Length × width | Surface | Edge lights |
|---|---|---|---|
| 03/21 | 5,099 × 60 ft | Asphalt, good condition | Medium intensity |
Runway ends and traffic pattern
| End | Pattern | Glide slope lights | Instrument | Displaced threshold | Landing distance |
|---|---|---|---|---|---|
| 03 | Not stated | 2-light PAPI, left | None listed | None listed | Not listed |
| 21 | Not stated | 2-light PAPI, left | None listed | None listed | Not listed |
VHF
Frequencies
- CTAF
- 122.8
- Actvt Reils Rwy 03 & 21; Papi Rwy 03 & 21; Mirl Rwy 03/21 - Ctaf
- UNICOM
- 122.8
- Automated Unicom.
Before you go
Brief 9S5 in Ascent EFB.
Current weather, NOTAMs and the airport diagram for Three Forks, in the app on iPhone and iPad.
Not for navigation. Verify with current FAA charts and the Chart Supplement before flight.
Source: FAA NASR 28-day subscription, cycle effective Oct 29, 2026. Airport data changes every 28 days and NOTAMs can override it at any time.