Garden Valley, Idaho · field elev 3,177 ft
Density Altitude at Garden Valley (U88)
From a field elevation of 3,177 ft, a typical July afternoon at Garden Valley (89 °F) raises density altitude to about 5,788 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 | 26.5 | 1,765 ft | 33.7 | 2,260 ft |
| February | 31.2 | 2,089 ft | 40.9 | 2,746 ft |
| March | 39.5 | 2,652 ft | 51.6 | 3,453 ft |
| April | 46.2 | 3,099 ft | 60.3 | 4,015 ft |
| May | 53.8 | 3,596 ft | 69.4 | 4,590 ft |
| June | 60.8 | 4,047 ft | 78.0 | 5,122 ft ▲ |
| July | 68.4 | 4,527 ft | 89.0 | 5,788 ft ▲ |
| August | 67.1 | 4,446 ft | 88.8 | 5,776 ft ▲ |
| September | 58.9 | 3,925 ft | 79.2 | 5,196 ft ▲ |
| October | 47.5 | 3,185 ft | 63.5 | 4,219 ft |
| November | 34.8 | 2,335 ft | 43.8 | 2,940 ft |
| December | 26.5 | 1,765 ft | 33.3 | 2,233 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 U88
DENSITY ALTITUDE caution
Field elevation 3,177 ft — the air behaves like 5,788 ft.
- PRESSURE ALT
- 3,179 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 Idaho fields
- U98 — Idaho City Usfs
Idaho City · elev 3,920 ft
- U70 — Cascade
Cascade · elev 4,748 ft
- 0U1 — Warm Springs Creek
Lowman · elev 4,831 ft
- U45 — Graham Usfs
Atlanta · elev 5,726 ft
- S78 — Emmett Municipal
Emmett · elev 2,354 ft
- 52U — Weatherby Usfs
Atlanta · elev 4,503 ft
- KBOI — Boise Air Trml/Gowen Field
Boise · elev 2,872 ft
- U63 — Bruce Meadows
Stanley · elev 6,370 ft
Frequently asked questions
How high does density altitude get at U88 in summer?
On a typical July afternoon — around 89 °F at the nearest NOAA normals station — density altitude at Garden Valley reaches roughly 5,788 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 U88 on an average day?
It swings with the seasons: from roughly 1,765 ft at the coldest month's average temperature to about 4,527 ft at the warmest month's — all from a constant field elevation of 3,177 ft. The month-by-month table above carries the full year.
What is the field elevation of Garden Valley?
3,177 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is U88 (FAA), in Garden Valley, Idaho.