KTZR Bolton Fld

PROBABLE 68%

Runway 4 — local convention slightly favors it

No D-ATIS feed here — a voice ATIS/AWOS may exist; check the frequency. ADS-B tracking just started here — traffic history is still building. Wind calm — no directional preference.

certainty: 68% evidence: NONE Class D

Wind calm · VFR · 24 min old · from KCMH (13.1 nm away)

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4 62% 5500 ft · calm-wind rwy

22 38% 5500 ft

Why — evidence behind this answer

Runway 4

PRIOR 4 is the designated calm-wind runway +0.50

Sources consulted

source	status	age	note
D_ATIS	UNAVAILABLE		No D-ATIS at this field
METAR	OK	24 min	Nearest station KCMH (13.1 nm away)
ADSB	WARMING_UP	2262 min	Only 0 min of track history so far
NOTAM	OK
CIFP	NOT_CONFIGURED		Instrument procedures: phase 4

Recent operations

No operations observed in the last hour. (Only 0 min of track history so far)

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KTZR field & runways

Bolton Fld, Columbus, Ohio. Field elevation 904 ft. Class D airspace. Towered. Magnetic variation 5.0°W on record, 7.1°W 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 0.019°/year west — about 1° every 53 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
22	212.1°	219.2°	matches	5,500 ft	ASPH
4	32.1°	39.2°	matches	5,500 ft	ASPH	left	ILS calm-wind CALM WIND RWY.

Generated 09:14:36Z · auto-refreshes · JSON

KTZR ☆ Bolton Fld