Detroit/Grosse Ile, Michigan
KONZ Grosse Ile Muni
Grosse Ile Muni (KONZ) is a non-towered, public-use airport in Detroit/Grosse Ile, Michigan, at 590.5 ft MSL. It has 4 runways: 04/22 (4,846 by 100 ft, asphalt), 17/35 (4,424 by 75 ft, concrete), H1 (25 by 25 ft, concrete), H2 (25 by 25 ft, concrete). Right traffic for runways 04, 35. CTAF 123.0.
FAA NASR data effective Oct 29, 2026. Not for navigation; verify with current FAA charts and the Chart Supplement.
Airport
At a glance
- Identifiers
- ICAO KONZ, FAA ONZ
- Location
- Detroit/Grosse Ile, Michigan (Wayne County). 2 NM S of the city center
- Elevation
- 590.5 ft MSL
- Position
- 42.0991° N, 83.1615° W
- Control tower
- No, non-towered
- Sectional chart
- Detroit
- Magnetic variation
- 7° W (2010)
- Fuel
- 100LL, Jet A
- Ownership
- Publicly owned, open to the public
- Attendance
- MON-FRI 0800-1800; SAT-SUN PRIOR ARNGMT
4 runways
Runways
| Runway | Length × width | Surface | Edge lights |
|---|---|---|---|
| 04/22 | 4,846 × 100 ft | Asphalt, good condition | Medium intensity |
| 17/35 | 4,424 × 75 ft | Concrete, poor condition | Medium intensity |
| H1 | 25 × 25 ft | Concrete | Not listed |
| H2 | 25 × 25 ft | Concrete | Not listed |
Runway ends and traffic pattern
| End | Pattern | Glide slope lights | Instrument | Displaced threshold | Landing distance |
|---|---|---|---|---|---|
| 04 | Right traffic | 4-light PAPI, left | None listed | None listed | Not listed |
| 22 | Left traffic | 4-light PAPI, left | None listed | 428 ft | Not listed |
| 17 | Left traffic | 4-light PAPI, left | None listed | 672 ft | Not listed |
| 35 | Right traffic | 4-light PAPI, left | None listed | None listed | Not listed |
| H1 | Not stated | None listed | None listed | None listed | Not listed |
| H2 | Not stated | None listed | None listed | None listed | Not listed |
VHF
Frequencies
- CTAF
- 123.0
- Actvt Reil Rwy 04 & 22; Papi Rwy 04, 22, 17, & 35; Mirl Rwy 04/22 & 17/35 - Ctaf.
- UNICOM
- 123.0
- Approach / departure
- 134.3
- "Detroit"
Weather station
- AWOS-3P ONZ
- 119.675
Before you go
Brief KONZ in Ascent EFB.
Current weather, NOTAMs and the airport diagram for Grosse Ile Muni, in the app on iPhone and iPad.
Not for navigation. Verify with current FAA charts and the Chart Supplement before flight.
Source: FAA NASR 28-day subscription, cycle effective Oct 29, 2026. Airport data changes every 28 days and NOTAMs can override it at any time.