Gardiner, Montana · field elev 5,286 ft
Density Altitude at Gardiner (29S)
Gardiner is a genuine high-and-hot field: from 5,286 ft of elevation, a typical July afternoon (87 °F) pushes density altitude to about 8,235 ft — the airplane performs like it is 2,949 ft above the field before the wheels roll.
Typical density altitude by month
| Month | Avg temp °F | DA at avg temp | Afternoon high °F | DA on a typical afternoon |
|---|---|---|---|---|
| January | 25.8 | 4,343 ft | 34.7 | 4,944 ft |
| February | 28.3 | 4,513 ft | 38.4 | 5,190 ft ▲ |
| March | 36.9 | 5,090 ft | 48.5 | 5,849 ft ▲ |
| April | 44.5 | 5,590 ft | 57.2 | 6,405 ft ▲ |
| May | 53.0 | 6,138 ft | 66.9 | 7,011 ft ▲ |
| June | 61.9 | 6,700 ft | 77.4 | 7,651 ft ▲ |
| July | 70.2 | 7,214 ft | 87.2 | 8,235 ft ⚠ |
| August | 68.9 | 7,134 ft | 86.0 | 8,164 ft ⚠ |
| September | 59.9 | 6,575 ft | 75.5 | 7,536 ft ▲ |
| October | 47.1 | 5,759 ft | 59.8 | 6,569 ft ▲ |
| November | 33.8 | 4,884 ft | 43.7 | 5,538 ft ▲ |
| December | 25.3 | 4,309 ft | 33.8 | 4,884 ft |
▲ above 5,000 ft · ⚠ above 8,000 ft. These are planning references at standard pressure and dry air — afternoon humidity and low pressure both push the real number higher. Run today's values below.
Run today’s numbers for 29S
DENSITY ALTITUDE high DA
Field elevation 5,286 ft — the air behaves like 8,223 ft.
- PRESSURE ALT
- 5,288 ft
- ISA DEVIATION
- —
- RULE-OF-THUMB DA
- —
- AIR DENSITY INDEX
- —
- AIR DENSITY
- —
- WATER · GRAINS/LB
- —
For training and reference · verify with official sources and your POH before flight · no tool on this site renders a go / no-go judgment
Nearby Montana fields
- KWYS — Yellowstone
West Yellowstone · elev 6,649 ft
- KEKS — Ennis Big Sky
Ennis · elev 5,433 ft
- KLVM — Mission Field
Livingston · elev 4,659 ft
- KBZN — Bozeman Yellowstone International
Bozeman · elev 4,473 ft
- 6S0 — Big Timber At Howard Field
Big Timber · elev 4,494 ft
- 9U1 — Wilsall
Wilsall · elev 5,140 ft
- 9S5 — Three Forks
Three Forks · elev 4,089 ft
- KRED — Red Lodge
Red Lodge · elev 5,762 ft
Frequently asked questions
How high does density altitude get at 29S in summer?
On a typical July afternoon — around 87 °F at the nearest NOAA normals station — density altitude at Gardiner reaches roughly 8,235 ft at standard pressure. Hotter-than-normal days, low pressure, and humidity all push it higher, so run the day's actual numbers before flying.
What is the density altitude at 29S on an average day?
It swings with the seasons: from roughly 4,309 ft at the coldest month's average temperature to about 7,214 ft at the warmest month's — all from a constant field elevation of 5,286 ft. The month-by-month table above carries the full year.
What is the field elevation of Gardiner?
5,286 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 29S (FAA), in Gardiner, Montana.