3U9 Weather Boulder Airport

Boulder, MontanaElevation 4,968 ftSmall airport

OFF-FIELD REFERENCE

Nearest report: KBTM · 22 NM SW · 51 min old

No ceiling, visibility 10 SM.

No on-field report, so no field flight category. Conditions at the field may differ.

OFF-FIELD REFERENCE · KBTM

WIND

140@6

steady

VISIBILITY

10 SM

16.1 km

CEILING

None

no BKN/OVC layer

ACTIVE NWS ALERTS

Active weather alerts

Dense Fog AdvisoryModerate · Expected · Likely

25 1905Z to 26 1800Z

Elkhorn and Boulder Mountains; Canyon Ferry Area; Missouri Headwaters; Madison River Valley; Gallatin Valley; Northwest Beaverhead County; Beaverhead and Western Madison below 6000ft; Gallatin and Madison County Mountains and Centennial Mountains

* WHAT...Variable visibility down to a quarter mile or less in dense fog. * WHERE...Canyon Ferry Area, Elkhorn and Boulder Mountains, Beaverhead and Western Madison below 6000ft, Gallatin Valley, Gallatin and Madison County Mountains and Centennial Mountains, Madison River Valley, Missouri Headwaters, and Northwest Beaverhead County. * WHEN...Until noon MDT Monday. * IMPACTS...Low visibility co…

If driving, slow down, use your headlights, and leave plenty of distance ahead of you.

Alerts from the National Weather Service. For situational awareness only; always confirm against an official briefing.

FORECAST & PILOT NOTES · SUPPLEMENTAL

Extended forecast and pilot notes

No aviation METAR is published for this airport. The nearest National Weather Service station reports wind from 207° at 1 kt. This observation is older than usual, so treat it with extra caution. Treat this as supplemental, not an aviation observation. Forecast suggests this afternoon mostly sunny, high near 40F, low near 20F, 2% chance of precipitation. Key risks: no significant hazards are highlighted right now, but always confirm against an official briefing.

Day	Conditions	Temp F	Wind	Gusts	Precip
This Afternoon	Mostly Sunny	40/20	NNE 4 kt	–	2%
Monday	Patchy Fog then Partly Sunny	50/33	SSE 7 kt	–	79%
Tuesday	Chance Rain And Snow	45/27	WSW 14 kt	21 kt	30%
Wednesday	Sunny	47/26	SW 8 kt	–	13%
Thursday	Mostly Sunny	46/26	SSW 4 kt	–	18%
Friday	Slight Chance Light Snow	44/27	ENE 3 kt	–	33%
Saturday	Slight Chance Light Snow	47/27	SW 2 kt	–	22%

Source: National Weather Service (office TFX). Forecast issued 2343Z.

Radar

Radar data: NOAA/NWS MRMS composite reflectivity. For situational awareness only, not a substitute for an official weather briefing.

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RUNWAYS & WIND

1 runway

WIND

No on-field weather data

No reporting weather station on the field, so wind components cannot be computed. See nearby stations below.

RUNWAYS

Runway detail & declared distances

1 runway · longest 3,675 ft

11/29

Dimensions

3,675 x 72 ft

Surface

Turf (fair)

RWY 11130°T

Traffic patternLeft

RWY 29310°T

Runway data from the FAA NASR dataset (effective 2026-06-11). Verify with the current Chart Supplement and NOTAMs.

FIELD CONDITIONS

Field elevation

4,968 ft MSL

Density and pressure altitude need a current temperature and altimeter from the METAR.

DAYLIGHT & NIGHT

Sun & logging windows

Sunset

0025Z 6:25 PM

Sunrise

1400Z 8:00 AM

Loggable night

0055Z (6:55 PM local) → 1329Z (7:29 AM local)

end of evening to start of morning civil twilight

Position lights required

0025Z (6:25 PM local) → 1400Z (8:00 AM local)

sunset to sunrise (91.209)

Night passenger currency

0125Z (7:25 PM local) → 1300Z (7:00 AM local)

1 hr after sunset to 1 hr before sunrise (61.57(b))

FAA definitions, shown in Zulu with airport-local time. Verify for your operation.

AIRPORT INFORMATION

Facility & services

Boulder Airport is in Boulder, Montana. Field elevation 4,968 ft MSL. Airport facts are drawn from OurAirports and the FAA NASR dataset.

OPERATIONS & CONTACT

OwnershipPublicly owned

UseOpen to the public

TypeSmall airport

ManagerAL MARTINI

Manager phone(406) 431-7519

AttendedUNATNDD

CHARTS & AIRSPACE

ICAO / IATA3U9

SectionalGREAT FALLS

Center (ARTCC)SALT LAKE CITY

Flight service (AFSS)GREAT FALLS

RegionMontana

CountryUnited States

Coordinates46.2116, -112.1060

Distance from city2 NM S

SERVICES & LIGHTING

Control towerNon-towered

CTAF122.900

FREQUENCIES

Communications

122.900

CTAF

Not all tower/ground/approach frequencies are in our datasets. Verify with the FAA Chart Supplement.

AIRCRAFT ACTIVITY

Traffic patterns

Aircraft activity data is not available for this airport yet.

NEARBY AIRPORTS

Weather reference stations

3U9 has no on-field report. Nearest reporting station: KBTM (22 NM SW, VFR).

KBTM Bert Mooney Airport

22 NM SW

VFR

KHLN Helena Regional Airport

24 NM N

VFR

KBZN Bozeman Yellowstone International Airport

IFR

IFR

VFR

KGTF Great Falls International Airport

82 NM N

VFR

AIRPORT REMARKS

Operational remarks

›NO SNOW REMOVAL

›-2 FT DRAINAGE DITCH +1 FT BERM WEST SIDE OF RY FULL LENGTH; 43 FT FM RY 11/29 CNTRLN.

›RY 11/29 THLDS & EDGES MARKED WITH WHITE CONES

›NO PHONE ON AIRPORT.

›HAS 1% TO 3% UPHILL GRADIENT FROM RY 29 END TO RY 11 END.

›FOR CD CTC HELENA APCH AT 406-449-5756/5761, WHEN APCH CLSD CTC SALT LAKE ARTCC AT 801-320-2568.

OFFICIAL LINKS & SOURCES

↗Search NOTAMs (official FAA NOTAM Search)

↗Wikipedia

↗3U9 on OurAirports

FREQUENTLY ASKED

Does 3U9 have a METAR?

No on-field METAR is issued for 3U9. This page uses the nearest reporting station as a reference.

Does 3U9 have a TAF?

No TAF is issued directly for 3U9. Use the nearest TAF-issuing field as a planning reference.

What is the field elevation at 3U9?

3U9 sits at 4,968 ft MSL, which factors into the density-altitude estimate on this page.

Is this an official preflight weather briefing for 3U9?

No. wxdecoder.com is for education and situational awareness only. It is not an official weather briefing or a substitute for official sources, NOTAM review, and pilot judgment.

This app is for aviation weather education, training, and situational awareness only. It is not a substitute for an official weather briefing, approved flight-planning software, flight service, dispatch procedures, current FAA regulations, or pilot judgment. Always verify weather with official sources before flight.