Grindstone Air Harbor
29C · Port Austin, MI · Non-towered · Print kneeboard · Open on the map
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Weather
METAR observed
TAF forecast
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Sun & FAA night2026-09-18 · night begins 08:06 PM
| Event | Local (EDT) | UTC |
|---|---|---|
| Morning civil twilight Loggable night ends | 06:45 AM | 10:45Z |
| Sunrise | 07:14 AM | 11:14Z |
| Sunset | 07:37 PM | 23:37Z |
| Evening civil twilight Loggable night begins | 08:06 PM | 00:06Z |
Plan a flight from 29C
Winds aloft NOAA forecast · 3,000 to 53,000 ft
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Full reports: nearest reporting station
Advisories
NOTAMs · Loading NOTAMs…
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Runways
RWY 18LEFT traffic
- Heading
- 185° mag · 178° true
- Dimensions
- 1,800 × 85 ft
- TPA
- 1,600 ft MSL (≈1,000 AGL) · standard
- Surface
- Turf
- CTAF
- 122.9
Enter the left downwind (heading 005°) on the 45° at 1,600 ft MSL (≈1,000 AGL).
More details — RWY 18
- Threshold elev
- 611 ft
- Approach obstacle
- Trees, 18 ft, 0 ft from threshold, 65 ft R of centerline
Pattern side: FAA NASR · TPA standard 1,000 ft AGL (not charted) · layout: FAA runway-end coordinates
| Runway | Length | Your margin |
|---|---|---|
| 18/36 | 1,800 ft |
Prefer one flat page? Full runway details for 29C → · New to pattern entries? The 45° entry, explained → · Teaching here? Print the 29C kneeboard →
Comms & NavAids
Communication frequencies
Taxi & takeoff
Source: FAA NASR (current 28-day cycle).
Prefer one flat list? All 29C frequencies →
Charts & procedures
No published instrument procedures or Chart Supplement for 29C — open it on the VFR sectional →
Airport info
Airport information
- FAA LID
- 29C
- Coordinates
- 44.0468, -82.9144
- Elevation
- 640 ft MSL
- Magnetic variation
- 7W
- Sectional chart
- LAKE HURON
- Airport use
- Public
- Control tower
- No
- ARTCC
- MINNEAPOLIS (ZMP)
- Flight service (FSS)
- LANSING · 1-800-WX-BRIEF
- NOTAM facility
- LAN
- Attendance
- UNATNDD
- Segmented circle
- No
- Wind indicator
- yes
- Activated
- 1996/11
- Distance from city
- 4 E
Night operations
- Pilot-controlled lighting
- Usually keyed on CTAF 122.9 — confirm the click sequence in the Chart Supplement
FAA night windows (civil twilight, loggable night §1.1, currency §61.57) are under Sun & FAA night in the Weather section.
Ownership & management 2 contacts
Remarks FAA · 6 notes
General
- FOR CD CTC MINNEAPOLIS ARTCC AT 651-463-5588.
- DEER & LRG BIRDS ON & INVOF ARPT.
Runways
- 3 FT YELLOW CONES.
- 3 FT YELLOW CONES.
Obstructions
- CTLG OBSTN EXCEEDS A 45 DEG SLP. APCH RATIO 16:1 TO THR OVR +76 FT TREE, 1244 FT DIST, 42 FT L. APCH RATIO 20:1 OVR 27 FT PLINE, 570 FT DIST, 125 FT L/R.
- CTLG OBSTN EXCEEDS A 45 DEG SLP. APCH RATIO 20:1 OVR 25 FT PLINE, 720 FT DIST, 125 FT L/R.
Nearby airports
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Also nearby: E53 Engler Field (13 NM) · MI03 Gentner Strip (private) (22 NM) · 6D9 Iosco County (27 NM) · 98G Sebewaing Township (30 NM)
About 29C
Grindstone Air Harbor (29C) is an airport in Port Austin, MI, at 640 ft MSL. It has 1 runway, the longest 1,800 ft, with no control tower (pilot-controlled). This page shows live METAR/TAF weather, runway crosswinds, frequencies, navaids, and FAA charts for 29C, refreshed from the Aviation Weather Center and FAA NASR.
Does 29C have a control tower?
No. Grindstone Air Harbor is a non-towered (pilot-controlled) airport; use the published CTAF/UNICOM in the Comms & NavAids section.
What is the longest runway at 29C?
Grindstone Air Harbor has 1 runway; the longest is 1,800 ft. See the Runways section for headings, surface, and lighting.
Where is 29C?
Grindstone Air Harbor is in Port Austin, MI, at an elevation of 640 ft MSL. Coordinates: 44.0468, -82.9144.
More about 29C
Weather is live from the Aviation Weather Center; airport facility data is from the FAA NASR (28-day cycle). For planning and education only; always verify against official sources. Open 29C in a full tool: METAR/TAF decoder, crosswind calculator, sun & night times, or the density altitude calculator. Planning from here? Find the nearest airport with fuel or an approach, or check whether an IFR alternate is required.
Something here wrong or out of date? Report a data problem.