Boulder
3U9 · Boulder, MT · Non-towered · Print kneeboard · Open on the map
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Weather
METAR observed
TAF forecast
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Sun & FAA night2026-09-21 · night begins 07:58 PM
| Event | Local (MDT) | UTC |
|---|---|---|
| Morning civil twilight Loggable night ends | 06:44 AM | 12:44Z |
| Sunrise | 07:14 AM | 13:14Z |
| Sunset | 07:28 PM | 01:28Z |
| Evening civil twilight Loggable night begins | 07:58 PM | 01:58Z |
Plan a flight from 3U9
Winds aloft NOAA forecast · 3,000 to 53,000 ft
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Full reports: nearest reporting station
Advisories
NOTAMs · Loading NOTAMs…
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Airspace hazards · Checking SIGMETs and G-AIRMETs…
Temporary flight restrictions · Checking for TFRs…
Runways
RWY 11LEFT traffic
- Heading
- 113° mag · 130° true
- Dimensions
- 3,675 × 72 ft
- TPA
- 6,000 ft MSL (≈1,000 AGL) · standard
- Surface
- Turf
- CTAF
- 122.9
Enter the left downwind (heading 293°) on the 45° at 6,000 ft MSL (≈1,000 AGL).
More details — RWY 11
- Threshold elev
- 4,968 ft
- Markings
- nonstandard
Pattern side: FAA NASR · TPA standard 1,000 ft AGL (not charted) · layout: FAA runway-end coordinates
| Runway | Length | Your margin |
|---|---|---|
| 11/29 | 3,675 ft |
Prefer one flat page? Full runway details for 3U9 → · New to pattern entries? The 45° entry, explained → · Teaching here? Print the 3U9 kneeboard →
Comms & NavAids
Communication frequencies
Taxi & takeoff
Source: FAA NASR (current 28-day cycle).
Nearby navigation aids
HIA 113.70 · HLN 117.70 · CPN 116.05
| NavAid | Type | Freq · ch | Range | Radial / Dist magnetic |
|---|---|---|---|---|
| HIA · Whitehall | VOR/DME | 113.70 · 84X | High | r349° / 21.2 NM |
| HLN · Helena | VORTAC | 117.70 · 124X | High | r183° / 24.6 NM |
| CPN · Coppertown | VOR/DME | 116.05 · 107Y | Low | r052° / 28.7 NM |
Prefer one flat list? All 3U9 frequencies →
Charts & procedures
Airport info
Airport information
- FAA LID
- 3U9
- Coordinates
- 46.2117, -112.1076
- Elevation
- 4,968 ft MSL
- Magnetic variation
- 17E
- Sectional chart
- GREAT FALLS
- Airport use
- Public
- Control tower
- No
- ARTCC
- SALT LAKE CITY (ZLC)
- Flight service (FSS)
- GREAT FALLS · 122.3 · 1-800-WX-BRIEF
- NOTAM facility
- GTF
- Attendance
- UNATNDD
- Segmented circle
- Yes
- Wind indicator
- yes
- Activated
- 1963/07
- Distance from city
- 2 S
Night operations
- Pilot-controlled lighting
- Usually keyed on CTAF 122.9 — confirm the click sequence in the Chart Supplement ↗
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
- Bottled oxygen
- NONE
- Bulk oxygen
- NONE
- Airframe service
- NONE
- Powerplant service
- NONE
- Parking
- tiedowns
Ownership & management 2 contacts
Remarks FAA · 6 notes
General
- NO SNOW REMOVAL
- NO PHONE ON AIRPORT.
- -2 FT DRAINAGE DITCH +1 FT BERM WEST SIDE OF RY FULL LENGTH; 43 FT FM RY 11/29 CNTRLN.
- FOR CD CTC HELENA APCH AT 406-449-5756/5761, WHEN APCH CLSD CTC SALT LAKE ARTCC AT 801-320-2568.
Runways
- RY 11/29 THLDS & EDGES MARKED WITH WHITE CONES
- HAS 1% TO 3% UPHILL GRADIENT FROM RY 29 END TO RY 11 END.
Nearby airports
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Also nearby: MT43 Klies Air Strip (private) (13 NM) · MT96 Ram Ranch Runway (private) (17 NM) · MT41 Jefco Skypark (private) (20 NM) · MT06 Duncan (private) (22 NM) · MT83 Ten Mile (private) (22 NM) · MT46 M4 Strip (private) (22 NM)
About 3U9
Boulder (3U9) is an airport in Boulder, MT, at 4,968 ft MSL. It has 1 runway, the longest 3,675 ft, with no control tower (pilot-controlled). This page shows live METAR/TAF weather, runway crosswinds, frequencies, navaids, and FAA charts for 3U9, refreshed from the Aviation Weather Center and FAA NASR.
Does 3U9 have a control tower?
No. Boulder is a non-towered (pilot-controlled) airport; use the published CTAF/UNICOM in the Comms & NavAids section.
What is the longest runway at 3U9?
Boulder has 1 runway; the longest is 3,675 ft. See the Runways section for headings, surface, and lighting.
Where is 3U9?
Boulder is in Boulder, MT, at an elevation of 4,968 ft MSL. Coordinates: 46.2117, -112.1076.
More about 3U9
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 3U9 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.
Something here wrong or out of date? Report a data problem.