KGTF Great Falls Intl

UNKNOWN

Unknown — not enough evidence to call a runway

We don't know, and saying so beats guessing. No D-ATIS feed here — a voice ATIS/AWOS may exist; check the frequency. No ADS-B traffic data available. Weather observation is 5002 minutes old — treat with caution.

certainty: — evidence: NONE no tower now Class D

Wind 220° true at 15 kt · VFR · 5002 min old

▶ Listen live — ATIS/CTAF on LiveATC opens LiveATC’s own player · verify the broadcast yourself

21 26% 10502 ft · 15 kt head, 1 kt x-left

3 26% 10502 ft · 15 kt TAIL, 1 kt x-right

17 24% 6030 ft · 12 kt head, 10 kt x-right

35 24% 6030 ft · 12 kt TAIL, 10 kt x-left

Active NOTAMs affecting runways

APCH OTS RWY 3 until 11-17 21:11Z

NAV ILS RWY 03 IM U/S

LIGHTING RWY 35 until 10-20 23:59Z

RWY 35 PAPI U/S

Why — evidence behind this answer

Runway 21

PRIOR runway length 10502 ft +0.06
WIND 15 kt headwind, 1 kt left crosswind 5002 min ago +0.00

Runway 3

PRIOR runway length 10502 ft +0.06
WIND 15 kt TAILWIND, 1 kt right crosswind 5002 min ago -0.00

Runway 17

PRIOR runway length 6030 ft -0.06
WIND 11 kt headwind, 10 kt right crosswind 5002 min ago +0.00

Runway 35

PRIOR runway length 6030 ft -0.06
WIND 11 kt TAILWIND, 10 kt left crosswind 5002 min ago -0.00

Sources consulted

source	status	age	note
D_ATIS	UNAVAILABLE		No D-ATIS at this field
METAR	OK	5002 min
ADSB	UNAVAILABLE		No ADS-B track history here yet
NOTAM	OK
CIFP	NOT_CONFIGURED		Instrument procedures: phase 4

Recent operations

No operations observed in the last hour. (No ADS-B track history here yet)

Was this right?

KGTF field & runways

Great Falls Intl, Great Falls, Montana. Field elevation 3680 ft. Class D airspace. Non-towered (ATCT-TRACON). Magnetic variation 13.0°E on record, 11.5°E today.

The FAA's variation of record is the number this field was surveyed against; the second is where north points now, from WMM2025. It is moving 0.1°/year west — about 1° every 10 years — which is why runway numbers eventually stop matching their pavement.

Runway data from the FAA NASR 01 Oct 2026 cycle. Where NASR locates both thresholds, the true heading is the bearing between them rather than NASR's whole-degree alignment. Magnetic is that heading against *today's* declination from WMM2025, not the field's variation of record — so it can differ from the chart by the gap between the two shown above. The number painted on the runway is the one ATC uses.
Runway	True	Magnetic	Number	Length	Surface	Pattern	Notes
17	180.0°	168.5°	matches	6,030 ft	ASPH	left
21	224.9°	213.4°	matches rule gives runway 22 in ~16 yr	10,502 ft	ASPH	left
3	44.9°	33.4°	matches rule gives runway 4 in ~16 yr	10,502 ft	ASPH	left	ILS
35	0.0°	348.5°	matches	6,030 ft	ASPH	left

Generated 11:14:59Z · auto-refreshes · JSON

KGTF ☆ Great Falls Intl