Tunnel Hill 100

Event Overview

Course & Terrain

Fast out-and-back rail-trail course centered on the Tunnel Hill State Trail near Vienna.

Key course features to know before comparing this race:

• Four passes through the 543-foot tunnel, 9.3 miles north of Vienna
• Breeden Trestle, the trail’s longest and highest at 90 feet, just south of Tunnel Hill
• Southern turnaround at the Wetland Center beyond Karnak, at miles 13.1 and 63.1
• The heated overnight aid tent at Vienna City Park, passed at miles 26.2, 50 and 76.2

Almost the whole course is finely crushed limestone over a dirt bed on the Tunnel Hill State Trail, the old Chicago & Eastern Illinois rail bed, with a few concrete sections. The maximum grade is 2 percent, and the trail stays between about 325 and 706 feet above sea level, topping out near the tunnel. There are no roots or rocks, and navigation is simple: one trail, run out and back twice, shared with oncoming runners, so keep right of center. The 543-foot tunnel and the trestles, including the 90-foot-high Breeden Trestle, are the main landmarks. Trekking poles are banned for the first 50 miles.

The organizer deliberately schedules the race in mid-November to avoid hot, humid days. National Weather Service 1991–2020 normals for November are a 58.5°F high and 37.5°F low at Paducah and 56.2°F and 35.0°F at Carbondale, both about 30 miles away, with about 4 inches of rain over the month. Race days vary: the 2022 edition was run in cold and snow, while in 2025 a cool 7:00 AM start gave way to a warmer midday. Sunset comes around 4:45 PM and sunrise around 6:30 AM, so most runners spend more than 13 hours in the dark, and the organizer suggests an extra jacket or tights in a drop bag.

Entry & Logistics

Why This Race Matters

Steve Durbin, a six-time Barkley Marathons starter from nearby Paducah, founded Tunnel Hill in 2014 with assistant director Jason Claunch and deliberately built it around speed instead of vertical gain. The 2026 race is the 13th edition. The rail trail has become ultrarunning’s fastest 100-mile proving ground: Camille Herron set a women’s 100-mile world record of 12:42:40 here in 2017, Zach Bitter ran 12:08:36 in 2018, and Sweden’s Elov Olsson lowered the men’s course record to 11:26:19 in 2023. In 2025 Ireland’s Caitriona Jennings ran 12:37:04, then the fastest 100 miles by a woman, on the same day Anne Flower set a 50-mile world record; Ashley Paulson went faster still, 12:19:34, at Jackpot in February 2026. The 100-miler carries an IAU Gold Label, and the 50-miler hosts the 2026 USATF championship.

Historical benchmark notes in the directory record (verify current records with the linked official sources):

• Men: Elov Olsson (Sweden), 11:26:19, 2023
• Women: Caitriona Jennings (Ireland), 12:37:04, 2025; the IAU lists it as the women’s 40–44 world record
• Camille Herron’s 12:42:40 here in 2017 is still the IAU’s official women’s 100-mile world record
• American age-group records (USATF): David Jones, 19:35:38 at age 70 (men 70–74), 2021; Wally Hesseltine, 26:22:34 at age 80 (men 80–84), 2023
• 50-mile world records in the Tunnel Hill 50: Charlie Lawrence, 4:48:21, 2023; Anne Flower, 5:18:57, 2025
• American 100 km record in the Tunnel Hill 100K: Courtney Olsen, 6:59:55, 2025

Preparing for a Race Like Tunnel Hill 100

The 100-mile race guide covers the format as a whole. These guides go deeper:

• Walking strategy for ultramarathons: When and how to walk by terrain, effort and cutoffs.
• Crew and aid-station strategy: Crew tables, aid stops, drop bags and runner preferences.
• Gut training for ultrarunners: A six-week practice sequence for race-day fueling.
• Tapering for ultramarathons: Plan the taper and race week around your own recovery.

Best Fit

• First-time 100-milers who want easy footing, frequent aid and a 30-hour limit
• Runners chasing a sub-24, sub-20 or sub-16 buckle or a 100-mile PR
• Elite runners targeting records on a USATF-certified, IAU Gold Label course
• Runners who need a late-season Western States qualifier

Planning Notes

• Treat intermediate cutoff gates as part of the course. Build enough margin for aid stops and late-race slowdown, and verify every current gate in the official rules.
• Train for terrain-specific fatigue. Technical trails and mountain courses demand downhill durability, hiking efficiency, and reliable night lighting.
• The directory marks this as having comparatively simpler logistics. That editorial label is not a safety rating; verify cutoffs, terrain, support, crew access, and withdrawal procedures.
• The second half has rolling cutoffs: you must leave Vienna for the second 50 miles by 10:00 PM Saturday (15 hours), and the course closes at 1:00 PM Sunday with no grace period.
• Miss a cutoff after dark and you must leave the course; miss one in daylight and your race becomes a 50-mile finish.
• Cold nights: November lows average below 40°F nearby, and the 2022 race was run in snow.
• No cups at any aid station, and trekking poles are banned for the first 50 miles.

Event FAQs

Related Preparation

• Compare verified US 100-mile races
• Compare this race in the full 2026 calendar
• Open the 100-Mile format guide
• Open the Fixed-Distance format guide
• Compare all race formats
• Use the timed-race pace calculator
• Plan checkpoint arrivals and cutoff buffers
• Print a pace band for your goal time
• Estimate race calories and plan fueling
• Build a crew and drop-bag plan
• Build a race-specific gear checklist