Portland, Oregon · field elev 39 ft
Density Altitude at Portland-Troutdale (KTTD)
Portland-Troutdale sits at 39 ft, and even a typical August afternoon (82 °F) only lifts density altitude to about 1,559 ft — heat still trims performance, but the field rarely turns high-and-hot.
Typical density altitude by month
| Month | Avg temp °F | DA at avg temp | Afternoon high °F | DA on a typical afternoon |
|---|---|---|---|---|
| January | 42.0 | −1,076 ft | 46.7 | −755 ft |
| February | 44.4 | −912 ft | 51.0 | −465 ft |
| March | 48.4 | −640 ft | 56.7 | −85 ft |
| April | 52.5 | −365 ft | 61.7 | 244 ft |
| May | 58.9 | 60 ft | 68.9 | 711 ft |
| June | 63.5 | 361 ft | 74.0 | 1,037 ft |
| July | 69.2 | 730 ft | 81.6 | 1,515 ft |
| August | 69.6 | 756 ft | 82.3 | 1,559 ft |
| September | 64.4 | 420 ft | 76.4 | 1,189 ft |
| October | 55.3 | −178 ft | 64.1 | 400 ft |
| November | 47.1 | −728 ft | 52.6 | −358 ft |
| December | 41.6 | −1,103 ft | 46.0 | −803 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 KTTD
DENSITY ALTITUDE
Field elevation 39 ft — the air behaves like 1,540 ft.
- PRESSURE ALT
- 40 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 Oregon fields
- KPDX — Portland International
Portland · elev 31 ft
- 03S — Sandy River
Sandy · elev 704 ft
- 4S9 — Mulino State
Portland-Mulino · elev 260 ft
- KHIO — Portland-Hillsboro
Portland · elev 208 ft
- KCZK — Cascade Locks State
Cascade Locks · elev 151 ft
- KSPB — Scappoose
Scappoose · elev 58 ft
- KUAO — Aurora State
Aurora · elev 200 ft
- 7S3 — Stark'S Twin Oaks Airpark
Hillsboro · elev 170 ft
Frequently asked questions
How high does density altitude get at KTTD in summer?
On a typical August afternoon — around 82 °F at the nearest NOAA normals station — density altitude at Portland-Troutdale reaches roughly 1,559 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 KTTD on an average day?
It swings with the seasons: from roughly −1,103 ft at the coldest month's average temperature to about 756 ft at the warmest month's — all from a constant field elevation of 39 ft. The month-by-month table above carries the full year.
What is the field elevation of Portland-Troutdale?
39 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KTTD (ICAO) / TTD (FAA), in Portland, Oregon.