KGTF Great Falls Intl

WIND_INFERRED 80%

Runway 35 — favored by the wind (6 kt at 310° true)

Based on wind only — no traffic or ATIS to confirm. No D-ATIS feed here — a voice ATIS/AWOS may exist; check the frequency. No ADS-B traffic data available.

certainty: 80% evidence: NONE no tower now Class D

Wind 310° true at 6 kt · VFR · 47 min old · from K1HM (26.6 nm away)

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

35 81% 6030 ft · 4 kt head, 5 kt x-left

17 19% 6030 ft · 4 kt TAIL, 5 kt x-right

21 CLOSED 10502 ft · 0 kt head, 6 kt x-right

3 CLOSED 10502 ft · 0 kt TAIL, 6 kt x-left

Active NOTAMs affecting runways

RWY CLOSED RWY 3/21 until 10-31 11:00Z

RWY 03/21 CLSD

RWY CLOSED RWY 3/21 until 10-31 11:00Z

RWY 03/21 CLSD DLY 0500-1100

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

NAV ILS RWY 03 IM U/S

Why — evidence behind this answer

Runway 35

WIND 4 kt headwind, 5 kt left crosswind 47 min ago +0.28

Runway 17

WIND 4 kt TAILWIND, 5 kt right crosswind 47 min ago -1.18

Runway 21

NOTAM 21 not considered — closed by NOTAM until 1100Z 31 Oct

Runway 3

NOTAM 3 not considered — closed by NOTAM until 1100Z 31 Oct

Sources consulted

source	status	age	note
D_ATIS	UNAVAILABLE		No D-ATIS at this field
METAR	OK	47 min	Nearest station K1HM (26.6 nm away)
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	CLOSED
3	44.9°	33.4°	matches rule gives runway 4 in ~16 yr	10,502 ft	ASPH	left	ILS CLOSED
35	0.0°	348.5°	matches	6,030 ft	ASPH	left

Generated 08:41:30Z · auto-refreshes · JSON

KGTF ☆ Great Falls Intl