Glen Canyon Natl Rec Area, Utah · field elev 4,167 ft
Density Altitude at Bullfrog Basin (U07)
From a field elevation of 4,167 ft, a typical July afternoon at Bullfrog Basin (100 °F) raises density altitude to about 7,609 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 | 36.1 | 3,651 ft | 46.3 | 4,328 ft |
| February | 41.2 | 3,992 ft | 52.8 | 4,750 ft |
| March | 49.9 | 4,563 ft | 63.3 | 5,419 ft ▲ |
| April | 57.7 | 5,064 ft | 71.7 | 5,942 ft ▲ |
| May | 67.6 | 5,688 ft | 81.8 | 6,557 ft ▲ |
| June | 79.0 | 6,388 ft | 94.0 | 7,282 ft ▲ |
| July | 85.5 | 6,779 ft | 99.6 | 7,609 ft ▲ |
| August | 82.5 | 6,600 ft | 96.6 | 7,434 ft ▲ |
| September | 73.7 | 6,065 ft | 87.9 | 6,922 ft ▲ |
| October | 59.8 | 5,198 ft | 73.5 | 6,053 ft ▲ |
| November | 46.1 | 4,315 ft | 58.3 | 5,103 ft ▲ |
| December | 35.9 | 3,638 ft | 46.1 | 4,315 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 U07
DENSITY ALTITUDE caution
Field elevation 4,167 ft — the air behaves like 7,632 ft.
- PRESSURE ALT
- 4,169 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 Utah fields
- U96 — Cal Black Meml
Halls Crossing · elev 4,395 ft
- 1L7 — Escalante Municipal
Escalante · elev 5,737 ft
- KHVE — Hanksville
Hanksville · elev 4,454 ft
- 66V — Bluff
Bluff · elev 4,476 ft
- KBDG — Blanding Municipal
Blanding · elev 5,868 ft
- 38U — Wayne Wonderland
Loa · elev 7,027 ft
- KBCE — Bryce Canyon
Bryce Canyon · elev 7,590 ft
- U64 — Monticello
Monticello · elev 6,970 ft
Frequently asked questions
How high does density altitude get at U07 in summer?
On a typical July afternoon — around 100 °F at the nearest NOAA normals station — density altitude at Bullfrog Basin reaches roughly 7,609 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 U07 on an average day?
It swings with the seasons: from roughly 3,638 ft at the coldest month's average temperature to about 6,779 ft at the warmest month's — all from a constant field elevation of 4,167 ft. The month-by-month table above carries the full year.
What is the field elevation of Bullfrog Basin?
4,167 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is U07 (FAA), in Glen Canyon Natl Rec Area, Utah.