Course Description

"A wonderful 100 miler that I would do again.  Not many races of any distance will be more scenic"  - Joshua H.      YT 2012

"The course is beautiful and fast.  I definitely enjoyed breathing the fresh air and seeing the multitude of stars at night.  I think this would be a perfect course for someone who is doing their first 100 miler"     - Linda M.      YT 2012 

The 100-mile race starts in West Yellowstone, Montana and the 50-mile race starts at mile 51 of the 100-mile course atthe Lower Mesa Falls parking lot in Mesa Falls (outside of Ashton, ID).

This is a road race that primarily follows the beautiful Teton Scenic By-way from west entrance of Yellowstone National Park to the base of the Teton mountain range in Driggs, Idaho (just outside of Jackson Hole, Wyoming).  

A detailed course description for the 100 Mile Race, with landmarks and Aid Station locations, can be downloaded HERE

A detailed course description for the 50 Mile Race, with landmarks and Aid Station locations, can be downloaded HERE.

*IMPORTANT: The updated mileage description for the 2015 event changed slightly due to a new finish line location. 

Click HERE to go to the maps page to see an overview of the courses and elevation profiles. *IMPORTANT: The milelage for the 2015 event will change slightly due to a new finish line locations.  Details will be posted as soon as they are available.

Starting line for the YT 100 miler is at the Bear Statue on S. Canyon in West Yellowstone, MT
START Bear Statue (on S. Canyon, south of Yellowstone Ave) START
0.25 Head south to dead end of S. Canyon and turn around  
0.5 Return to Starting Line and pass by Bear Statue  
0.57 Pass through intersection of Yellowstone Ave, continuing straight on Canyon
0.69 Turn RIGHT (west) onto Madison Ave  
0.8 Turn RIGHT (south) onto Boundary St  
0.91 Turn RIGHT (west) onto Yellowstone Ave  
1 Stay on Yellowstone Ave - passing through intersection of S/N Canyon  
1.7 Turn RIGHT (north) onto Iris St.  
2 Turn LEFT (west) onto Hwy 20/Targhee Pass Hwy  
ALERT Course follows Hwy 20 for ~35 miles to the Mesa Falls Scenic Byway (Hwy 47), where it turns LEFT
6.2 South Fork Madison River Sign  
7.5 KOA Campground Sign  
9.1 Super 8 Motel/Lions Head  
10.6 - H2O Idaho State Line / Welcome to Idaho Sign Water Only Stop
11.4 Howard Springs Rest Stop (Public Toilets)  
13.2 Big Horn Hills  
15.3 - AS Valley View Laundry (after 1st Exxon Station) AID STATION #1
17.9 Meadow Creek Rd Sign  
19.2 Flat Ranch Drift Lodge (left side)  
21.4 2nd Exxon Station  
22.7 Robins Roost  
24.3 - AS Stage Stop Gas  AID STATION #2
27.7 Bank of Idaho / Phillips 66  
28.1 Loop Road (left side)  
29.8 Sinclair / Pond's Lodge  
30.1 - H2O Island Park Ranger Station (left side) Water Only Stop
32.1 Chick Creek Road  
33.5 Buffalo Run Campground & RV Park (left side)  
34.2 Orvis Fly Shop / Shell Station  (LAST GAS STATION BEFORE ASHTON)  
ALERT DO NOT STAY ON HWY 20 - Sharp left turn onto Hwy 47  
37.4 - AS Procced on Hwy #47 - Aid station in turn out/parking area on RIGHT AID STATION #3
39.1 Cattle Guard (first on scenic byway) - WATCH FOR COWS ON ROAD!!  
39.8 Cattle Guard (number 2) - watch your step!  
41.4 Forest Service Rd #315 (left side)  
45.5 - H2O S. Hatchery Butte Rd (left side) Water Only Stop
46.4 Forest Service Rd #607 (right side)   
48.6 Cattle Guard (third on scenic loop)  
49.4 Pole Bridge Road sign (left side)  
50.1 Mesa Falls - UPPER sign  (50 MILE START)  
50.9 Mesa Falls LOWER Parking Lot - In Parking Lot, near the Restroom Facility AID STATION #4
52.9 Mesa Falls Scenic Byway Overlook (right side of road)  
53.2 Large parking lot (right side of road) w/ restrooms; start section of narrow, widing road
ALERT Narrow, winding section of road with blind curves for 2.8 miles! Stop only in designated turn-outs
55.9 Leaving National Forest Sign (right side)   
56.7 H2O Warm River Bridge (start of steady uphill) Water Only Stop
59.6 Cave Falls Road (left side)  
60.6 - AS COURSE TURN - Runners stay straight/slightly left onto 4000 E. AID STATION #5
ALERT DO NOT FOLLOW Hwy 47 as it curves to the right - stay straight, and slightly uphill!
60.6 Stay on 4000 E and cross over 1300 N - road will then drop downhill and to the right
61.8 4000 E dead ends at 1200 N  
ALERT Turn LEFT at dead end onto 1200 N and cross Kirkham Bridge  
61.9 Continue STRAIGHT on 1200 N until 4300 E (at Squirrel Cemetery)  
64.8 - H2O Turn RIGHT onto 4300 E (at Squirrel Cemetery/American Flag on pole) Water Only Stop
ALERT Continue STRAIGHT on 4300 E, crossing 1100 N and 1000 N  
66.7 When crossing 1000 N, DO NOT PARK near White House on left side of road…Owner is not friendly
67.5 Pavement turns to gravel  
68 4300 E Dead Ends -> Turn RIGHT onto 875 N at Dead End  
69.7 Steep Downhill, then Uphil & winding road - BE CAREFUL  
70.7 Grainery Tower/shanty building on right  
70.8 Turn LEFT onto Main Street (Children at Play & 15 Speed Limit Signs)  
ALERT This is a tricky turn  - look for the landmarks listed above, as well as an old white camper
70.9 - AS Rough Riders Saloon (in Drummond, ID) AID STATION #6
70.9 Dead End at Stop Sign - Turn LEFT onto Hwy 32: RUN FACING TRAFFIC  
75.2 - H2O Tall Grain Elevator/Silo in large turnout on (runner) left side of road  
78.2 4700 E  
80.9 - AS 500 N (just north of Mile Post 9) - Steel Grey Barn AID STATION #7
82 Bridge / "Entering Teton County" sign  
82.9 W. 14000 N  
86.1 "Entering Felt" Sign  
86.6 McRenyolds Rd sign / Silos  
86.8 - H2O *TURN RIGHT* from Hwy 33 onto W. 10000 N. (gravel road), head west Water Only Stop
87.8 Slight uphill (after 5000 W on right side of road - DO NOT turn here)  
87.9 *TURN LEFT* at top of hill onto N 5000 W (narrow gravel rd - will pass Felt Cemetery after1/2 mi)  
90 Pass metal barn (on right) - road will seem more like a trail on this section  
91 - AS Aid Station on N. 5000 W., just past Haden Cemetery  AID STATION #8
92.3 Pass through intersection of W 5750 N / Breckenridge Herefords Sign  
94 - ALERT *TURN LEFT* at Stop Sign onto W 4000 N - back on pavement  
96 Pass through intersection of N 3000 W - stay straight  
97.1 - H2O *TURN LEFT* from 4000 N onto N 2000 W (gravel road) Water Only Stop
98.8 - ALERT *TURN LEFT* from gravel onto paved Hwy 33 (be aware of fast moving, on-coming traffic)
99 Tetonia Sign  
99.7 Teton Peaks Lodge on Left - DO NOT Turn here - must continue on pavement toward Gas Station
99.8 *TURN LEFT* on N. 3000 W after patch of grass  
99.9 *TURN LEFT* onto Egbert Ave. - Proceed to Finish Line  
100.1 FINISH - Front of Teton Peaks Lodge (Egbert Street - Tetonia) FINISH