Bison or Bust! The Tertiary Trek 🦬 2026

eventNovember 7, 2026
location_onChicago, IL

Weather at a Glance

thermostat
Temperature
48°F - 61°F
Feels like 47°F - 63°F
water_drop
Precipitation
0% chance
air
Wind
6 mph W
Gusts to 15 mph
wb_sunny
UV Index
3
open_in_newOfficial Siteopen_in_newRegister
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Minute-by-minute wind, rain, and temperature along your route.

Routes

(A) Midewin A, 200k (2026 Detour) Route Forecast

straighten124 mi
trending_up919 ft
schedule

Temperature

9:00 AM12:00 PM3:00 PM4648505254565860626446485052545658606264
Temperature (°F)
Feels Like (°F)

Precipitation

9:00 AM12:00 PM3:00 PM0102030405060708090100Very LightLightModerateHeavyVery Heavy
Probability (%)
Intensity

Wind

9:00 AM12:00 PM3:00 PM02468101214160246810121416
Wind Speed (mph)
Gusts (mph)

Wind Direction

Route map + wind
7 mph W Gusts to 15 mph
Interactive map loading

(B) Will your Midewin B a Century? (2026 Detour) Route Forecast

straighten85 mi
trending_up925 ft
schedule

Temperature

9:00 AM12:00 PM3:00 PM464850525456586062464850525456586062
Temperature (°F)
Feels Like (°F)

Precipitation

9:00 AM12:00 PM3:00 PM0102030405060708090100Very LightLightModerateHeavyVery Heavy
Probability (%)
Intensity

Wind

9:00 AM12:00 PM3:00 PM0246810121402468101214
Wind Speed (mph)
Gusts (mph)

Wind Direction

Route map + wind
6 mph W Gusts to 14 mph
Interactive map loading

(C) Midewin C, to the Obstinacy! (Final) Route Forecast

straighten43 mi
trending_up548 ft
schedule

Temperature

12:00 PM2:00 PM4:00 PM545658606264545658606264
Temperature (°F)
Feels Like (°F)

Precipitation

12:00 PM2:00 PM4:00 PM0102030405060708090100Very LightLightModerateHeavyVery Heavy
Probability (%)
Intensity

Wind

12:00 PM2:00 PM4:00 PM0246810121402468101214
Wind Speed (mph)
Gusts (mph)

Wind Direction

Route map + wind
7 mph WNW Gusts to 14 mph
Interactive map loading

From the Epic Ride Weather app powered by  Weather and other data sources

Details

Bison or Bust! The Tertiary Trek 🦬 2026 is a road, gravel cycling event in Chicago, IL on November 7, 2026. Visit the official website for event details, or register on the registration page.

This event features 3 routes: the (C) Midewin C, to the Obstinacy! (Final) (43 mi, 548 ft elevation gain), the (B) Will your Midewin B a Century? (2026 Detour) (85 mi, 925 ft elevation gain), and the (A) Midewin A, 200k (2026 Detour) (124 mi, 919 ft elevation gain). Check the route-specific weather forecasts above to plan your ride.

Public & Free Join our Strava club (https://www.strava.com/clubs/obstinacy) for updates! Download the timetable: (https://www.icloud.com/iclouddrive/0f4GMZLJiI9KhcV4tl1iayh-w#Public_Timetable) 🔔 Hear Ye Hear Ye 🔔 By way of bipartisan act of Congress and signed by President Obama into federal law, National Bison Day (🦬) will be henceforth observed the first Saturday of every November! To celebrate this momentous occasion of the newly-dubbed “National Mammal” join a glorious mixed road & light gravel ride to a bison herd / obstinacy at Midewin National Tallgrass Prairie. “Bison or Bust! The Tertiary Trek” This remix of our inaugural 2024 ride is on the preserve’s 30th anniversary, for which they domesticated their roughest gravel segment. Ride With GPS routes have the full details featuring POIs and intermediary stops. Fill up at Metric and Jitters, stock snacks, then food trucks will be posted at the after party. Rendezvous include Metric Coffee (All), Blackberry Market (A & B), Jitters Cafe (All), Midewin Welcome Center (All), and The Junction vintage shop (All) for the after party. Everyone returns same-day to LaSalle St. Station by a specially-reserved Metra car. Before Joliet, anyone starting with “A” group can switch to “B” by just waiting. Everyone can switch to any other group at Jitters in Joliet, as well as the Midewin Welcome Center. All roads lead to roam!

Start times and routes can change. Be sure to verify the date, start time, route, and other details with the event organizers.

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