KEKS · Ennis Big Sky Airport

ENNIS, MONTANA · SMALL AIRPORT

5,423

Elevation ft

Runway

7,600

Longest ft · 16/34

45.27N

111.65W

Ennis Big Sky Airport serves Ennis, Montana at 5,423 ft elevation with its longest runway, 16/34, at 7,600 by 100 ft. The figures below are computed from FAA NASR runway data (via OurAirports) and the same rules of thumb JetDesk uses on the airport page in the app; the POH and current NOTAMs are the authority.

Open KEKS in JetDesk: live METAR, TAF, winds and runway verdict →

01Runways

Runway	Length × width	Surface	Lighting
16/34	7,600 × 100 ft	asphalt	lit

02Density altitude and turboprop runway margins

Standard temperature at 5,423 ft is about 4°C. Every 1,000 ft of density altitude adds roughly 8 percent to a turboprop's takeoff distance and 5 percent to its landing distance. The table uses Piper Meridian book numbers (2,438 ft takeoff and 2,110 ft landing over a 50 ft obstacle at sea level, ISA, max weight) as a reference airplane; heavier turboprops and light jets scale the same way from their own POH figures.

Conditions	Density altitude	Takeoff est.	Landing est.	Landing × 1.5
Standard day (ISA, 4°C)	5,423 ft	3,496 ft	2,682 ft	4,023 ft
Warm day (ISA +10)	6,623 ft	3,730 ft	2,809 ft	4,213 ft
Hot day (ISA +20)	7,823 ft	3,964 ft	2,935 ft	4,403 ft
35°C afternoon	9,125 ft	4,218 ft	3,073 ft	4,609 ft

Planning aid only. Even on a 35°C afternoon the longest runway (16/34, 7,600 ft) covers a Meridian-class turboprop's landing distance with a 50 percent margin (4,609 ft needed). The percentages are a generic rule of thumb applied to one reference airplane, not certified performance data for any specific aircraft, and the runway size categories describe the runway, not your airplane's suitability. Verify with the approved flight manual before every flight.

03Nearby fields with 5,000 ft or more

Useful as alternates, as fuel stops when the price at KEKS is high, or as the longer runway on a hot afternoon.

Airport	Distance	Longest runway
KRVF Ruby Valley Field	32 nm NW	6,000 ft
K9S5 Three Forks Airport	37 nm N	5,100 ft
KBZN Bozeman Yellowstone International Airport	37 nm NE	8,994 ft
KDLN Dillon Airport	38 nm W	6,501 ft
KWYS Yellowstone Airport	42 nm SE	8,400 ft
KBTM Bert Mooney Airport	54 nm NW	9,000 ft

04Jet A prices and FBOs at KEKS

No public API publishes FBO fuel prices, so JetDesk does not guess. Pilots and crews log the price they actually paid at KEKS, the app flags a price stale after two weeks, and the route finder ranks every field within a corridor of your route by net savings after the cost of the extra cycle. Log a price at KEKS or read what a fuel stop actually saves.

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