Join the vibrant celebration of trail running at La Ronde des Grangeons in Ambérieu-en-Bugey on September 5-6, 2026. This beloved event, celebrating its 28th edition, offers four distinct trail courses—a challenging 35km, a classic 16km, a 10km, and a festive hike—plus a Nordic walk and kids' races. With over 2,500 participants, a festive village atmosphere, and a post-race party, it's the perfect weekend for athletes and families. Don't wait to register, as spots for the 10km, 15km, and 16km races are limited!
Races Offered
Trail 28 km
Sep 05, 2026
straighten
Distance —
28K
terrain
Type —
Running
timer
14:30
Trail 16 km
Sep 05, 2026
straighten
Distance —
16K
terrain
Type —
Running
timer
15:30
Trail 10 km
Sep 05, 2026
straighten
Distance —
10K
terrain
Type —
Running
timer
16:00
9 km
Sep 06, 2026
straighten
Distance —
9K
terrain
Type —
Running
timer
16:15
Weather History
These values represent the 3-year monthly averages for September in Ambérieu-en-Bugey.
thermostatTemperature
12.9° / 22.3°
wb_sunnyFeels like
11.6° / 21.1°
light_mode
Avg sunshine hours
9h 35m
water_drop
Avg rainfall
4.4 mm
ac_unit
Avg snowfall
—
air
Avg wind speed
9.1 km/h (Light breeze)
opacity
Sweat loss rate
Moderate
terrain
Course conditions
Firm and slightly soft
sunny
Max UV Index
Moderate (3.5)
humidity_mid
Humidity
72.9%
wb_twilight
Sunrise
07:17
nightlight
Sunset
19:49
About Ambérieu-en-Bugey
Learn more about the host city, Ambérieu-en-Bugey.
Ambérieu-en-Bugey is a commune in the Ain department, Auvergne-Rhône-Alpes region, France. With 14,288 inhabitants (2020), it is one of the largest towns of the historical region of Bugey.