Siskiyou County Airport (KSIY), California
Landing essentials
Whether you can land, whether you can refuel, and how customs works here.
Overview
Siskiyou County Airport (KSIY) serves Montague, California, with a single long asphalt runway suited to business aircraft operating in the region north of Mount Shasta. The field sits at 2,651 feet elevation and operates without a control tower, relying on CTAF for traffic coordination. Business aviation accounts for the large majority of the airport's annual operations, according to 2025 FAA TFMSC data.
Runways
Siskiyou County Airport has one paved runway, 17/35, 7,490 ft long and 150 ft wide, with an asphalt surface.
Runway geometry from published threshold coordinates. Not for navigation.
Source: FAA Form 5010.
Fuel and airfield services
Siskiyou County Airport has Jet A available on the field. Fueling is available from 8am to 5pm, daily, and the airport has no control tower.
Source: FAA Form 5010 / NASR.
Customs
Siskiyou County Airport does not clear customs. The nearest port of entry is O33, 99 NM away.
Source: CBP list of ports of entry.
Business aviation traffic
Siskiyou County Airport recorded 535 business aviation movements in 2025. Traffic peaks in September. Business aviation traffic at KSIY concentrates in the spring and late summer months, peaking in September, according to 2025 FAA TFMSC data.
Business jet movements, FAA TFMSC count. Peak month September, 67 movements in 2025.
Source: FAA TFMSC, business jet movements, 2025.
Climate
Siskiyou County Airport averages 23.1 days above 90°F in July and 25.0 freeze days in January. July is the warmest month, with average highs of 93.4°F, and December the coldest, at 45.7°F.
Weather station is on the field. Some values are estimated by the agency. 1991–2020 climate normals.
Source: NOAA NCEI.
Operating constraints
Siskiyou County Airport has published operating constraints in four categories: access, runway notes, environmental and other notes.
Pilots should be alert for glider operations from May through September.
Runway lighting for runway 17/35, along with the PAPI and REIL systems on both runways 17 and 35, is pilot-activated via CTAF.
Sensitive agricultural crops are located adjacent to the runway and taxiway. Rotorcraft should avoid operating in these areas.
Farming activities and equipment are present in the vicinity of the runways and taxiways.
Wildlife is present in the vicinity of the airport.
Migratory flocks of waterfowl are present in the vicinity of the airport during spring and fall.
US Forest Service fire operations occur from May through September.
For clearance delivery, contact Seattle Air Route Traffic Control Center.
Source: FAA Chart Supplement.
Nearby airfields
Siskiyou County Airport has five airfields within 40 NM. The closest is Montague-Yreka Rohrer Field, 4.61 NM southwest.
Source: Skystar calculation from official coordinates.
Skystar at KSIY
We arrange catering, fuel and trip support here. Supplier prices reach you unchanged; our coordination fee sits on its own line.
The same order, priced two ways.
$2,400.00 catering order at KSIY.
Unchanged.
What the kitchen invoices us is what your quote reads.
One line, fixed.
It does not move with the size of the order.
At cost.
Passed on at the exact amount the processor took.
Market practice figures are industry averages, not a specific competitor.
Frequently asked questions
What is the runway length at KSIY?
KSIY, Siskiyou County Airport in Montague, California, has a single runway, 17/35, measuring 7,490 feet long and 150 feet wide. The surface is asphalt. This length supports a range of business jet types without payload restrictions tied to runway distance. The airport is non-towered, so arriving and departing aircraft coordinate on CTAF rather than with a control tower. Field elevation is 2,651 feet, a factor worth including in performance planning for summer operations.
Is fuel available at KSIY?
Siskiyou County Airport (KSIY) stocks Jet A fuel only, with no avgas listed in the field data. The airport is uncontrolled and keeps an attendance schedule of 0800 to 1700 daily. Aircraft operating outside these hours should plan fuel needs accordingly, since staffed hours govern fuel service availability. There is no indication of self-service fuel in the data. Dispatchers should confirm fuel service status directly with the airport for flights arriving near the edges of the published attendance window.
Does KSIY have on-site customs clearance?
Siskiyou County Airport (KSIY) has no on-site customs service. The nearest customs facility is O33, located approximately 99 nautical miles away. Flights requiring customs clearance need to route through that facility or another designated port of entry before or after a stop at KSIY. This distance is a meaningful planning factor for international arrivals that might otherwise treat KSIY as a clearance point. Operators should build the additional routing time into trip planning rather than assume any customs capability at the field.
What wildlife and agricultural hazards are noted at KSIY?
Siskiyou County Airport (KSIY) carries several environmental cautions in its field remarks. Migratory waterfowl flocks are reported near the airport during spring and fall, and general wildlife presence is noted in the vicinity year-round. Farming activity and equipment operate near the runways and taxiways, and sensitive agricultural crops sit adjacent to the runway and taxiway, with a specific caution for rotorcraft to avoid those areas. Glider operations also occur in the area from May through September. Crews should factor these hazards into approach and taxi planning.
When is business aviation traffic busiest at KSIY?
Business aviation traffic at Siskiyou County Airport (KSIY) concentrates in the warmer months of the year, based on 2025 FAA TFMSC data. September recorded the highest monthly count at 67 operations, followed by July at 58 and March at 52. February was the lowest month at 14 operations. Total annual business aviation operations reached 535 out of 695 overall operations for the year. This seasonal pattern lines up with the period when USFS fire operations and glider activity are also active near the field, from May through September.