
About the event
The Ridgeline 50K Ultra Marathon, part of the Castle Rock Trail Festival on October 4, 2025, challenges participants with a 31-mile course through Philip S. Miller Park and Ridgeline Open Space. With technical trails, steep climbs, and breathtaking views, the race tests even the most experienced runners. Organized by the Town of Castle Rock, the event features strategically placed aid stations and a festive finish line atmosphere. Completing this ultra marathon is a remarkable accomplishment, celebrated with a finisher’s medal and the support of the running community.
Date:
Sat
Oct 4
2025
Location:
Distance:
Elevation profile:
Flat
Website:
LinkElevation gain:
Number of participants:
Find the best training plan for your goals and the distance you’re planning to run:
Stories from Runnas
On October 4, 2025, ultra runners will converge for the Ridgeline 50K Ultra Marathon, the most challenging race of the Castle Rock Trail Festival. This 31-mile event, organized by the Town of Castle Rock, offers a grueling yet rewarding course filled with technical trails and significant elevation changes.
If you are an official race organiser with any questions about this page, please get in touch: races@runna.com
Other races you might like
Our partners














$19.99
$119.99
$19.99
$129.99
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
AUD$29.99
AUD$179.99
€19.99
€119.99
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
€19.99
€119.99
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
€19.99
€119.99
$19.99
$119.99
R$99.90
R$599.90
$19.99
$119.99
$19.99
$119.99
BGN 39.99
BGN 249.99
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
CAD$27.99
CAD$162.99
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
$17,990
$99,990
¥128
¥798
$99,900
$599,900
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
€19.99
€119.99
€19.99
€119.99
Kč 499.00
Kč 2,990.00
$19.99
$119.99
kr 149.00
kr 999
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
E£599.99
E£3499.99
$19.99
$119.99
19.99
€119.99
$19.99
$119.99
$19.99
$119.99
€19.99
€119.99
€19.99
€119.99
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
€19.99
€119.99
$19.99
$129.99
€19.99
€119.99
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
$148.00
$888.00
Ft 7,990.00
Ft 49990
$19.99
$129.99
₹1,999.00
₹9,900
Rp 299,000.00
Rp 1,999,000
$19.99
$119.99
€19.99
€119.99
₪59.90
₪399.90
€19.99
€119.99
$19.99
$119.99
¥2,500
¥15,000
$19.99
$119.99
₸9,990
₸59,990
$19.99
$129.99
₩25,000.00
₩149,000
€19.99
€119.99
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
€19.99
€119.99
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
€19.99
€119.99
€19.99
€119.99
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
RM 79.90
RM 499.90
$19.99
$119.99
$19.99
$119.99
€19.99
€119.99
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
$399
$2,299
$19.99
$119.99
$19.99
$129.99
$19.99
$119.99
€19.99
€119.99
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
€19.99
€119.99
$29.99
$199.99
$19.99
$119.99
$19.99
$119.99
₦9,900.00
₦49,900
$19.99
$119.99
kr 229.00
kr 1490
$19.99
$119.99
Rs 4,900
Rs 29,900
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
PEN 69.90
PEN 399.90
₱999.00
₱5,990
zł 99.99
zł 599.99
€19.99
€119.99
QAR 69.99
QAR 399.99
lei 99.99
lei 599.99
₽1,490.00
₽9,990
$19.99
$119.99
SAR 79.99
SAR 499.99
$19.99
$119.99
€19.99
€119.99
$19.99
$119.99
$19.99
$119.99
$24.98
$149.98
€19.99
€119.99
€19.99
€119.99
$19.99
$119.99
R 399.99
R 2,299.99
€19.99
€119.99
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
kr 229.00
kr 1,329.00
CHF 18.00
CHF 100
$19.99
$119.99
$590.00
$3,990
$19.99
129.99
TZS 39,900.00
TZS 249,900
THB 699
THB 3990
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
₺399.99
₺2,499.99
$19.99
$119.99
$19.99
$119.99
AED 69.99
AED 399.99
£15.99
£99.99
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99
₫499,000.00
₫2,999,000
$19.99
$119.99
$19.99
$119.99
$19.99
$119.99