Big Sky Field
S85 · Culbertson, MT · Non-towered · Print kneeboard
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Weather
METAR observed
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TAF forecast
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Sun & FAA night2026-08-04 · night begins 09:06 PM
| Event | Local (MDT) | UTC |
|---|---|---|
| Morning civil twilight Loggable night ends | 05:01 AM | 11:01Z |
| Sunrise | 05:37 AM | 11:37Z |
| Sunset | 08:30 PM | 02:30Z |
| Evening civil twilight Loggable night begins | 09:06 PM | 03:06Z |
Plan a flight from S85
Winds aloft NOAA forecast · 3,000 to 53,000 ft
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Advisories
NOTAMs
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Pilot reports
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Airspace hazards
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Runways
RWY 26LEFT traffic
- Heading
- 257° mag · 270° true
- Dimensions
- 3,800 × 60 ft
- TPA
- 3,000 ft MSL (≈1,000 AGL) · standard
- Surface
- Asphalt
- Lights
- 2-light PAPI (left) (3°)
- CTAF
- 122.8
Enter the left downwind (heading 077°) on the 45° at 3,000 ft MSL (≈1,000 AGL).
More details — RWY 26
- Threshold elev
- 1,934 ft
- Markings
- basic
- Threshold crossing height
- 27 ft
Pattern side: FAA NASR · TPA standard 1,000 ft AGL (not charted) · layout: FAA runway-end coordinates
| Runway | Length | Your margin |
|---|---|---|
| 08/26 | 3,800 ft |
Prefer one flat page? Full runway details for S85 → · New to pattern entries? The 45° entry, explained → · Teaching here? Print the S85 kneeboard →
Comms & NavAids
Communication frequencies
Before taxi
Taxi & takeoff
Source: FAA NASR (current 28-day cycle).
Nearby navigation aids
ISN 116.30
| NavAid | Type | Freq · ch | Range | Radial / Dist magnetic |
|---|---|---|---|---|
| ISN · Williston | VOR/DME | 116.30 · 110X | Low | r251° / 30.7 NM |
Prefer one flat list? All S85 frequencies →
Charts & procedures
Airport info
Airport information
- FAA LID
- S85
- Coordinates
- 48.1533, -104.5040
- Elevation
- 1,953 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 · 122.3 · 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
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 under Sun & FAA night in the Weather section.
Services fuel · repairs · oxygen · attendance
- 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 2 contacts
Remarks FAA · 5 notes
General
- FOR CD CTC SALT LAKE ARTCC AT 801-320-2568.
- 2,876 FT TWRS 3.5 MIS NW.
Lighting
- ACTVT MIRL RY 08/26 & PAPI RY 26 - CTAF.
Fuel
- SELF SERVICE CREDIT CARD 24/7
Attendance
- ON CALL ALL HOURS 406-787-6680/0660.
Nearby airports
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Also nearby: 02MT Steppler Field (private) (13 NM) · 5ND0 Stiehl Airport (19 NM) · 69MT Flying H Airport (private) (22 NM) · 5U6 Fairview Airport (25 NM) · PO1 Poplar Muni Airport (27 NM)
About S85
Big Sky Field (S85) is an airport in Culbertson, MT, at 1,953 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 in the Comms & NavAids section.
What is the longest runway at S85?
Big Sky Field has 1 runway; the longest is 3,800 ft. See the Runways section for headings, surface, and lighting.
Where is S85?
Big Sky Field is in Culbertson, MT, at an elevation of 1,953 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.
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.