Bison or Bust! The Tertiary Trek 🦬 2026
Weather at a Glance
Minute-by-minute wind, rain, and temperature along your route.
Routes
(A) Midewin A, 200k (2026 Detour) Route Forecast
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(B) Will your Midewin B a Century? (2026 Detour) Route Forecast
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Wind Direction
(C) Midewin C, to the Obstinacy! (Final) Route Forecast
Temperature
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Wind Direction
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.
Start times and routes can change. Be sure to verify the date, start time, route, and other details with the event organizers.
Get the Full Weather Experience
Pick the best time to ride
Forecasts show wind, rain, and temperature minute-by-minute along your route.
Choose the best direction
Plan to maximize the tailwind, and avoid a headwind on the way home.
Dress perfectly
Know what to wear with temperature, wind, and real-feel data.
Plan nutrition & hydration
Stay fueled and hydrated with weather-based insights across your route.