Cut Bank, Montana · field elev 3,858 ft
Density Altitude at Cut Bank International (KCTB)
From a field elevation of 3,858 ft, a typical July afternoon at Cut Bank International (80 °F) raises density altitude to about 6,085 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 | 21.8 | 2,287 ft | 32.3 | 3,011 ft |
| February | 23.1 | 2,378 ft | 34.2 | 3,140 ft |
| March | 31.1 | 2,929 ft | 42.6 | 3,702 ft |
| April | 40.2 | 3,543 ft | 52.3 | 4,338 ft |
| May | 49.6 | 4,162 ft | 62.3 | 4,977 ft |
| June | 57.6 | 4,679 ft | 70.4 | 5,484 ft ▲ |
| July | 64.9 | 5,141 ft | 80.2 | 6,085 ft ▲ |
| August | 63.9 | 5,078 ft | 79.7 | 6,055 ft ▲ |
| September | 54.4 | 4,473 ft | 68.7 | 5,379 ft ▲ |
| October | 42.0 | 3,663 ft | 54.4 | 4,473 ft |
| November | 30.6 | 2,895 ft | 41.0 | 3,596 ft |
| December | 22.8 | 2,357 ft | 32.9 | 3,052 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 KCTB
DENSITY ALTITUDE caution
Field elevation 3,858 ft — the air behaves like 6,073 ft.
- PRESSURE ALT
- 3,860 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
- 7S7 — Valier
Valier · elev 3,826 ft
- KSBX — Shelby
Shelby · elev 3,443 ft
- 7S8 — Ross International
Sweetgrass · elev 3,553 ft
- H28 — Whetstone International
Port Of Del Bonita · elev 4,336 ft
- 8S0 — Starr-Browning Airstrip
Browning · elev 4,657 ft
- S01 — Conrad
Conrad · elev 3,548 ft
- 8U2 — Schafer /Usfs/
Schafer · elev 4,856 ft
- KCII — Choteau
Choteau · elev 3,947 ft
Frequently asked questions
How high does density altitude get at KCTB in summer?
On a typical July afternoon — around 80 °F at the nearest NOAA normals station — density altitude at Cut Bank International reaches roughly 6,085 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 KCTB on an average day?
It swings with the seasons: from roughly 2,287 ft at the coldest month's average temperature to about 5,141 ft at the warmest month's — all from a constant field elevation of 3,858 ft. The month-by-month table above carries the full year.
What is the field elevation of Cut Bank International?
3,858 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KCTB (ICAO) / CTB (FAA), in Cut Bank, Montana.