Fort Smith, Montana · field elev 3,242 ft
Density Altitude at Fort Smith Landing Strip (5U7)
From a field elevation of 3,242 ft, a typical July afternoon at Fort Smith Landing Strip (89 °F) raises density altitude to about 5,855 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 | 29.0 | 2,018 ft | 38.5 | 2,666 ft |
| February | 30.5 | 2,122 ft | 40.0 | 2,766 ft |
| March | 39.1 | 2,706 ft | 50.3 | 3,449 ft |
| April | 46.8 | 3,219 ft | 57.9 | 3,941 ft |
| May | 55.9 | 3,812 ft | 67.9 | 4,576 ft |
| June | 65.6 | 4,431 ft | 78.4 | 5,226 ft ▲ |
| July | 74.0 | 4,955 ft | 88.8 | 5,855 ft ▲ |
| August | 72.3 | 4,850 ft | 87.4 | 5,771 ft ▲ |
| September | 62.3 | 4,222 ft | 76.1 | 5,085 ft ▲ |
| October | 49.3 | 3,383 ft | 60.5 | 4,107 ft |
| November | 37.8 | 2,618 ft | 47.5 | 3,265 ft |
| December | 30.3 | 2,108 ft | 39.4 | 2,726 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 5U7
DENSITY ALTITUDE caution
Field elevation 3,242 ft — the air behaves like 5,867 ft.
- PRESSURE ALT
- 3,244 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
- 00U — Big Horn County
Hardin · elev 3,025 ft
- KBIL — Billings Logan International
Billings · elev 3,662 ft
- 6S8 — Laurel Municipal
Laurel · elev 3,543 ft
- 6S1 — Bridger Municipal
Bridger · elev 3,720 ft
- KRED — Red Lodge
Red Lodge · elev 5,762 ft
- 6S3 — Woltermann Meml
Columbus · elev 3,578 ft
- M46 — Colstrip
Colstrip · elev 3,428 ft
- 6U7 — Hysham
Hysham · elev 2,624 ft
Frequently asked questions
How high does density altitude get at 5U7 in summer?
On a typical July afternoon — around 89 °F at the nearest NOAA normals station — density altitude at Fort Smith Landing Strip reaches roughly 5,855 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 5U7 on an average day?
It swings with the seasons: from roughly 2,018 ft at the coldest month's average temperature to about 4,955 ft at the warmest month's — all from a constant field elevation of 3,242 ft. The month-by-month table above carries the full year.
What is the field elevation of Fort Smith Landing Strip?
3,242 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 5U7 (FAA), in Fort Smith, Montana.