Confront the ultimate Lake District challenge at the Altra 13 Valleys Ultra, September 25-27, 2026, a monumental three-day trail running odyssey that connects all 13 iconic valleys of the UNESCO World Heritage landscape. Choose your epic: the staggering 184km 13 Valleys route with 7000m of ascent, the 110km 7 Valleys, the 55km 5 Valleys, or the accessible 22km 2 Valleys Trail—each meticulously crafted to showcase the raw beauty and brutal grandeur of England's most celebrated mountains. This is a true navigational adventure on unmarked, world-class trails, demanding self-reliance and resilience as you traverse pristine lakes, high passes, and remote fells far from the tourist tracks. In partnership with the Lake District National Park, the event is a profound celebration of this protected landscape, with 5% of every entry directly funding environmental conservation projects. Whether you're an elite ultra-runner seeking a crown-jewel British challenge or a dedicated trail enthusiast stepping up to a multi-day adventure, 13 Valleys delivers an unforgettable, bucket-list experience. Secure your Saver entry for a late-September weekend where your effort becomes part of the landscape's legacy, and finishing is a legend-making achievement.
Races Offered
13 Valleys
Sep 25, 2026
straighten
Distance —
184.3K
terrain
Type ——
timer
18:00
7 Valleys
Sep 26, 2026
straighten
Distance —
110K
terrain
Type ——
timer
06:00
5 Valleys
Sep 26, 2026
straighten
Distance —
55K
terrain
Type ——
timer
08:00
2 Valleys
Sep 27, 2026
straighten
Distance —
22.4K
terrain
Type ——
timer
10:00
Weather History
These values represent the 3-year monthly averages for September in Ambleside.
thermostatTemperature
10.6° / 16.5°
wb_sunnyFeels like
8.6° / 14.4°
light_mode
Avg sunshine hours
7h 19m
water_drop
Avg rainfall
6.8 mm
ac_unit
Avg snowfall
—
air
Avg wind speed
12.5 km/h (Gentle breeze)
opacity
Sweat loss rate
Low
terrain
Course conditions
Firm and slightly soft
sunny
Max UV Index
Moderate (3.5)
humidity_mid
Humidity
86.4%
wb_twilight
Sunrise
06:45
nightlight
Sunset
19:26
About Ambleside
Learn more about the host city, Ambleside.
Ambleside is a town in Cumbria. It is located at the head of Windermere, England’s largest lake, within the Lake District National Park.
