Airport information
- FAA LID
- S85
- Coordinates
- 48.1533, -104.5040
- Elevation
- 1,954 ft MSL
- Magnetic variation
- 13E
- Sectional chart
- BILLINGS
- Airport use
- Public
- Control tower
- No
- Weather station
- AWOS-3 · 120.000 · ☎ 406-787-5819
- ARTCC
- SALT LAKE CITY (ZLC)
- Flight service (FSS)
- GREAT FALLS · 1-800-WX-BRIEF
- NOTAM facility
- GTF
- Attendance
- UNATNDD
- Beacon
- white-green (SS-SR)
- Segmented circle
- Yes
- Wind indicator
- lighted
- Activated
- 1950/10
- Distance from city
- 1 NE
Weather
METAR observed
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TAF forecast
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Sun & FAA night 2026-06-22
| Event | Local (MDT) | UTC |
|---|---|---|
| Morning civil twilight Loggable night ends | 04:16 AM | 10:16Z |
| Sunrise | 04:58 AM | 10:58Z |
| Sunset | 09:02 PM | 03:02Z |
| Evening civil twilight Loggable night begins | 09:44 PM | 03:44Z |
Plan a flight from S85
Night operations
- Airport lighting
- SEE RMK
- Rotating beacon
- white-green · SS-SR
- Pilot-controlled lighting
- ACTVT MIRL RY 08/26 & PAPI RY 26 - CTAF. on 122.8 — Chart Supplement ↗
Runway lighting aids — 26: 2-light PAPI (left).
FAA night windows (civil twilight, loggable night §1.1, currency §61.57) are in the live weather panel above.
Traffic pattern
- Landing
- Rwy 08 · 077°
- Pattern
- left (turns left)
- TPA
- 3,000 ft MSL (≈1,000 AGL)
- CTAF
- 122.8
Enter the left downwind for Rwy 08 at 3,000 ft MSL (≈1,000 AGL) on a 45°. TPA estimated at 1,000 ft AGL (not charted for this field).
Runway 08/26
3,800 ft × 60 ft · Asphalt (Good)- Heading
- 077° mag · 90° true
- Threshold elev
- 1,953 ft
- Markings
- basic
- Traffic pattern
- Left
- Heading
- 257° mag · 270° true
- Threshold elev
- 1,934 ft
- Markings
- basic
- VGSI
- 2-light PAPI (left) (3°)
- Traffic pattern
- Left
- Threshold crossing height
- 27 ft
| Runway | Length | Your margin |
|---|---|---|
| 08/26 | 3,800 ft |
Communication frequencies
Tower & ground
| ASOS/AWOS | 120.000 |
| CTAF | 122.8 |
| UNICOM | 122.8 |
Source: FAA NASR (current 28-day cycle).
Nearby navigation aids
| NavAid | Type | Freq | Radial / Dist magnetic |
|---|---|---|---|
| ISN · Williston | VORTAC | 116.30 | r247° / 30.7 NM |
Chart Supplement FAA A/FD
Open PDF ↗Preview Chart Supplement
VFR sectional
Services
- Fuel available
- 100LL
- Bottled oxygen
- NONE
- Bulk oxygen
- NONE
- Airframe service
- NONE
- Powerplant service
- NONE
- Parking
- tiedowns
- Other services
- Agricultural, Air ambulance, Survey
Ownership & management
Remarks FAA
- FOR CD CTC SALT LAKE ARTCC AT 801-320-2568.
- 2,876 FT TWRS 3.5 MIS NW.
- ACTVT MIRL RY 08/26 & PAPI RY 26 - CTAF.
- ON CALL ALL HOURS 406-787-6680/0660.
- SELF SERVICE CREDIT CARD 24/7
Nearby airports
Weather is live from the Aviation Weather Center; airport facility data is from the FAA NASR (28-day cycle). For planning and education only; always verify against official sources. Open S85 in a full tool: METAR/TAF decoder, crosswind calculator, sun & night times, or the density altitude calculator. Planning from here? Find the nearest airport with fuel or an approach, or check whether an IFR alternate is required.
About S85
Big Sky Field (S85) is an airport in Culbertson, MT, at 1,954 ft MSL. It has 1 runway, the longest 3,800 ft, with no control tower (pilot-controlled). This page shows live METAR/TAF weather, runway crosswinds, frequencies, navaids, and FAA charts for S85, refreshed from the Aviation Weather Center and FAA NASR.
Does S85 have a control tower?
No. Big Sky Field is a non-towered (pilot-controlled) airport; use the published CTAF/UNICOM on the Comms & NavAids tab.
What is the longest runway at S85?
Big Sky Field has 1 runway; the longest is 3,800 ft. See the Runways tab for headings, surface, and lighting.
Where is S85?
Big Sky Field is in Culbertson, MT, at an elevation of 1,954 ft MSL. Coordinates: 48.1533, -104.5040.
Fly out of S85 often?
Save S85 as your home base in the SkyReady app for a one-tap Go/No-Go readiness brief, weather alerts, and automatic FAA currency — free to log.