Welcome to Marin County Airport, Gnoss Field. This information should help you plan your flight into and out of the only public-use airport in Marin County.
Airport Information for Pilots
Weather at Gnoss Field might be called California nice. Morning low clouds often burn off before noon. The marine layer comes in occasionally from the Pacific Ocean due west or wraps around from the Golden Gate through San Pablo Bay from the southeast. Storms in the winter usually come from the southwest. Otherwise, most days are clear and pleasant.
- AWOS radio: 120.675
- AWOS phone: 415-897-2236
Crosswinds frequent Gnoss Field due to the high terrain to the west and cool waters of San Pablo Bay to the southeast. Gusts often increase the challenge of landing, so be prepared to go around. Some pilots claim that landing with crosswinds are better on runway 31 than runway 13 due to hangars and terrain, but be cautious.
Noise Abatement Procedures
Noise sensitive residents occupy homes to the south and southeast of the airport. Please see the Noise Abatement Procedures. In summary, no straight in approaches to runway 31 over the homes, and no straight out departures from runway 13 over the homes. Please fly tight traffic patterns for runway 31 to avoid overflight of the homes south and southeast of the airport.
VFR procedures must avoid the radio towers, which are 520' MSL. Traffic patterns may be inside or outside the towers depending on the performance of your aircraft. Approach the traffic pattern from outside the towers. For landing on runway 31, do not fly straight-in and turn base abeam the towers and plan a one-half mile final.
Gnoss Field has one instrument approach, GPS RWY 13. The minimums are 1000' MSL due to towers and terrain.
Instrument departures involve turns to headings 080 degrees from runway 13 and 360 degrees from runway 31.
Clearance for instrument departures can be received from Oakland Center, either by radio on the ground or through the FAA phone service. Some pilots file IFR flight plans with pickup points at nearby VORs, either Scaggs Island (SGD), Santa Rosa (STS), or Point Reyes (PYE).
- Oakland Center: 127.80
- FAA Clearance: 888-766-8267
Gnoss Field reserves transient parking on the ramp closest to the administration building in spaces outlined in blue stripes. Large aircraft may park at both ends of the row; smaller aircraft in between facing the runway.
Full-service fuel is available at 415-897-1653
The wash rack is located on the east side of the runway, midfield, between the two sets of hangars. Signs limit usage to selected days due to the California drought.
Several pedestrian gates allow people to walk through between the ramp and the parking lots. Vehicle gate access requires card entry, available from the Airport Manager and generally issued to airport tenants.
Wildlife Incident Report
Marin County requests that pilots report encountering wildlife on, above or near the airport. Use this form, as well as FAA form 5200-7 in the case of a wildlife strike.
Airport Information for Instructors
Numerous flight instructors train students at Gnoss Field, some based on the field and others seeking challenging conditions due to the crosswinds.
Prepare your students for the effects of gusty crosswind conditions. Winds rarely stay steady with variable speeds and directions common. Gusts to 25 knots are not uncommon with crosswinds ranging from 45 to 90 degrees across the runway.
Some pilots report that winds are more variable and challenging when landing on runway 13, due to terrain and less calming influence of the hangars at the runway 31 end.
Training areas may be used southeast of the airport near the mouth of the Petaluma River. Please avoid training flights over populated areas of Marin County, along highway 101, and inland lakes surrounded by homes.
Please avoid simulated engine power loss when near the noise-sensitive areas south and southeast of the airport, especially when landing on runway 31. Changes in engine noise cause greater annoyance than constant noise. Use runway 13 for such procedures.
Pilots in the area of Gnoss Field frequently use these reporting points:
- Sears Point Raceway: about 6 miles east of the airport
- Mouth of the Petaluma River: about 4 miles southeast of the airport
- Highway 37: also about 4 miles southeast of the airport
- KCBS Towers: the four illuminated radio towers, 520' MSL, about 1.5 miles southeast of the airport
- Bend in the River: a prominent bend in the Petaluma River about 4 miles north of the airport
- Landfill: a common base turn location about 1.5 miles north of the airport
Airport Information for Aircraft Owners
Aircraft owners and operators may park or store their aircraft at Gnoss Field.
Daily transient parking is free and no commercial landing fees apply.
Aircraft parked overnight on tie-downs will be tagged and fees are $10/night for small aircraft, $15/night for turboprop aircraft, and $20/night for turbine aircraft.
Hangars at Gnoss Field are clustered in three areas: A-hangars north of the ramp, B-hangars south of the ramp, and C-hangars on the east side of the runway. Hangars in the A and B clusters are privately owned on leased ramp space. Many are for rent or sale privately. Several offers are posted on the bulletin boards around the airport.
Hangars in the C cluster are leased from Marin County. All of the county hangars are presently rented, although a waiting list is being maintained.
County Storage Permit Form
To request a permit to store an aircraft at Gnoss Field, use this form to request a tie-down space on the ramp, a portable hangar or a county hangar.
Aircraft Storage Permit Form