Tillitt Field (1S3), Montana
Landing essentials
Whether you can land, whether you can refuel, and how customs works here.
Overview
Tillitt Field (1S3) is a public-use airport serving Forsyth, Montana, with a single paved runway. Business aviation traffic is light, consistent with its ops tier 3 classification.
Runways
Tillitt Field has one paved runway, 09/27, 4,799 ft long and 75 ft wide, with an asphalt surface.
Source: FAA Form 5010.
Fuel and airfield services
Tillitt Field has 100LL available on the field. The airport has no control tower.
Source: FAA Form 5010 / NASR.
Customs
Tillitt Field does not clear customs. The nearest port of entry is Williston Basin International (KXWA), 167 NM away.
Source: CBP list of ports of entry.
Business aviation traffic
Tillitt Field recorded 35 business aviation movements in 2025. Traffic peaks in June. Business aviation traffic at Tillitt Fld (1S3) concentrates in the late spring and summer months, with June recording the highest activity per FAA TFMSC data.
Business jet movements, FAA TFMSC count. Peak month June, 8 movements in 2025.
Source: FAA TFMSC, business jet movements, 2025.
Climate
Tillitt Field averages 15.7 days above 90°F in July, 30.5 freeze days in December and 3.6 snow days in January. July is the warmest month, with average highs of 88.0°F, and January the coldest, at 33.7°F.
Weather station is 2.1 NM from the field. Some values are estimated by the agency. 1991–2020 climate normals.
Source: NOAA NCEI.
Operating constraints
Tillitt Field has published operating constraints in two categories: runway notes and other notes.
Medium intensity runway lights (MIRL) for runway 09/27 operate from dusk until 2200; after 2200, activate via CTAF. PAPI for runways 09 and 27 is also pilot-activated via CTAF.
For clearance delivery, contact Salt Lake ARTCC.
Source: FAA Chart Supplement.
Nearby airfields
Tillitt Field has two airfields within 32 NM. The closest is Colstrip, 25.37 NM south.
Source: Skystar calculation from official coordinates.
Skystar at 1S3
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.
$600.00 catering order at 1S3.
Unchanged.
What the kitchen invoices us is what your quote reads.
One line, fixed.
The $75 minimum applies below $862.50.
At cost.
Passed on at the exact amount the processor took.
Market practice figures are industry averages, not a specific competitor.
Frequently asked questions
Is there jet fuel available at Tillitt Field (1S3)?
Tillitt Field (1S3) stocks 100LL only; Jet A is not available onsite. Flight planners requiring jet fuel should arrange an alternate fueling point along the route.
Are customs services available at 1S3?
Tillitt Field (1S3) has no onsite customs service. The nearest customs airport of entry is KXWA, located approximately 167 nautical miles away.
What runway is available at Tillitt Field?
Tillitt Field (1S3) has a single paved runway, 09/27, measuring 4,799 feet long and 75 feet wide with an asphalt surface. Runway lighting (MIRL) operates dusk to 2200 and can be pilot-activated via CTAF afterward.