Columbus, Ohio · field elev 904 ft
Density Altitude at Bolton Field (KTZR)
Bolton Field sits at 904 ft, and even a typical July afternoon (84 °F) only lifts density altitude to about 2,739 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 | 28.8 | −914 ft | 36.3 | −391 ft |
| February | 31.5 | −725 ft | 39.8 | −150 ft |
| March | 40.5 | −102 ft | 50.2 | 553 ft |
| April | 52.1 | 679 ft | 63.3 | 1,413 ft |
| May | 62.2 | 1,342 ft | 73.3 | 2,053 ft |
| June | 70.7 | 1,888 ft | 81.3 | 2,554 ft |
| July | 74.2 | 2,110 ft | 84.3 | 2,739 ft |
| August | 72.8 | 2,021 ft | 83.2 | 2,671 ft |
| September | 65.7 | 1,568 ft | 77.0 | 2,286 ft |
| October | 54.1 | 812 ft | 64.7 | 1,504 ft |
| November | 42.5 | 34 ft | 51.4 | 633 ft |
| December | 33.4 | −592 ft | 40.4 | −109 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 KTZR
DENSITY ALTITUDE
Field elevation 904 ft — the air behaves like 2,721 ft.
- PRESSURE ALT
- 905 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 Ohio fields
- KLCK — Rickenbacker International
Columbus · elev 744 ft
- KOSU — Ohio State University
Columbus · elev 906 ft
- KCMH — John Glenn Columbus International
Columbus · elev 815 ft
- KUYF — Madison County
London · elev 1,082 ft
- KMRT — Union County
Marysville · elev 1,021 ft
- KDLZ — Delaware Municipal/Jim Moore Field
Delaware · elev 945 ft
- KLHQ — Fairfield County
Lancaster · elev 868 ft
- I23 — Fayette County
Washington Court House · elev 980 ft
Frequently asked questions
How high does density altitude get at KTZR in summer?
On a typical July afternoon — around 84 °F at the nearest NOAA normals station — density altitude at Bolton Field reaches roughly 2,739 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 KTZR on an average day?
It swings with the seasons: from roughly −914 ft at the coldest month's average temperature to about 2,110 ft at the warmest month's — all from a constant field elevation of 904 ft. The month-by-month table above carries the full year.
What is the field elevation of Bolton Field?
904 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KTZR (ICAO) / TZR (FAA), in Columbus, Ohio.