Kalispell, Montana · field elev 2,977 ft
Density Altitude at Glacier Park International (KGPI)
From a field elevation of 2,977 ft, a typical July afternoon at Glacier Park International (82 °F) raises density altitude to about 5,135 ft — solidly into the range where performance charts deserve a close read.
Typical density altitude by month
| Month | Avg temp °F | DA at avg temp | Afternoon high °F | DA on a typical afternoon |
|---|---|---|---|---|
| January | 23.7 | 1,320 ft | 31.0 | 1,826 ft |
| February | 26.8 | 1,536 ft | 35.5 | 2,134 ft |
| March | 34.5 | 2,066 ft | 45.1 | 2,779 ft |
| April | 42.7 | 2,619 ft | 55.0 | 3,428 ft |
| May | 51.6 | 3,207 ft | 65.1 | 4,075 ft |
| June | 57.6 | 3,596 ft | 71.2 | 4,458 ft |
| July | 64.9 | 4,062 ft | 82.2 | 5,135 ft ▲ |
| August | 63.7 | 3,986 ft | 81.7 | 5,105 ft ▲ |
| September | 54.3 | 3,383 ft | 70.4 | 4,408 ft |
| October | 41.6 | 2,545 ft | 54.1 | 3,370 ft |
| November | 31.4 | 1,854 ft | 39.4 | 2,398 ft |
| December | 24.1 | 1,348 ft | 31.0 | 1,826 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 KGPI
DENSITY ALTITUDE caution
Field elevation 2,977 ft — the air behaves like 5,123 ft.
- PRESSURE ALT
- 2,979 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
- 58S — Whitefish
Whitefish · elev 3,066 ft
- S27 — Kalispell City
Kalispell · elev 2,932 ft
- 53U — Ferndale Airfield
Bigfork · elev 3,072 ft
- 8U4 — Spotted Bear /Usfs/
Spotted Bear · elev 3,672 ft
- 8S1 — Polson
Polson · elev 2,941 ft
- 8U2 — Schafer /Usfs/
Schafer · elev 4,856 ft
- 0S1 — Meadow Creek Usfs
Meadow Creek · elev 3,993 ft
- S09 — Hot Springs
Hot Springs · elev 2,763 ft
Frequently asked questions
How high does density altitude get at KGPI in summer?
On a typical July afternoon — around 82 °F at the nearest NOAA normals station — density altitude at Glacier Park International reaches roughly 5,135 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 KGPI on an average day?
It swings with the seasons: from roughly 1,320 ft at the coldest month's average temperature to about 4,062 ft at the warmest month's — all from a constant field elevation of 2,977 ft. The month-by-month table above carries the full year.
What is the field elevation of Glacier Park International?
2,977 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KGPI (ICAO) / GPI (FAA), in Kalispell, Montana.