![Arial view of the race city.](https://cdn.prod.website-files.com/6246d08bbd54788ee1fefb53/65cea7a4f1501b93eb0d368b_simon-hurry-vVNIGVa24Qg-unsplash.jpeg)
About the event
The FOURmidable 50K, held in Auburn, California, is an esteemed ultra-marathon known for its challenging terrain and significant elevation gain. The course features four major hills, including Cardiac Hill and K2, totaling over 6,000 feet of climbing, making it one of the most demanding 50K races in the region. This event has gained a reputation for its competitive nature, serving as a Team USA selection race and attracting elite runners. With its mix of scenic trails and tough climbs, the FOURmidable 50K offers a unique and rigorous test for trail running enthusiasts.
Date:
Sat
Feb 17
2024
Location:
Distance:
Elevation profile:
Hilly
Website:
LinkElevation gain:
Number of participants:
Other distances for this race
Find the best training plan for your goals and the distance you’re planning to run:
Stories from Runnas
The FOURmidable 50k is an ultramarathon trail race known for its challenging course, typically held in Auburn, California. This event is characterized by its rigorous terrain and significant elevation changes, making it a demanding yet rewarding race for experienced trail runners seeking a test of endurance and skill in a natural, scenic setting.
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
![](https://cdn.prod.website-files.com/6241c8c95eb4fa2f8a36e792/650aca34e8be0d3def62f266_cancer-research-uk.webp)
![](https://cdn.prod.website-files.com/6241c8c95eb4fa2f8a36e792/650aca4dbec278420c731463_london-winter-run.webp)
![Maverick logo.](https://cdn.prod.website-files.com/6241c8c95eb4fa2f8a36e792/65952d13f419958680ebc77d_maverick.webp)
![Motiv Running logo.](https://cdn.prod.website-files.com/6241c8c95eb4fa2f8a36e792/65952d13e2ef738240bf4586_motiv-running.webp)
![Belfast City Marathon logo.](https://cdn.prod.website-files.com/6241c8c95eb4fa2f8a36e792/65952d134773365d155dc65f_belfast-city-marathon.webp)
![Garmin Health logo.](https://cdn.prod.website-files.com/6241c8c95eb4fa2f8a36e792/65952d133d1a441dd42cb3d2_garmin-health.webp)
![UK Run Chat logo.](https://cdn.prod.website-files.com/6241c8c95eb4fa2f8a36e792/65952d1323a5d80e347e14de_uk-run-chat.webp)
![](https://cdn.prod.website-files.com/6241c8c95eb4fa2f8a36e792/650aca34e8be0d3def62f266_cancer-research-uk.webp)
![](https://cdn.prod.website-files.com/6241c8c95eb4fa2f8a36e792/650aca4dbec278420c731463_london-winter-run.webp)
![Maverick logo.](https://cdn.prod.website-files.com/6241c8c95eb4fa2f8a36e792/65952d13f419958680ebc77d_maverick.webp)
![Motiv Running logo.](https://cdn.prod.website-files.com/6241c8c95eb4fa2f8a36e792/65952d13e2ef738240bf4586_motiv-running.webp)
![Belfast City Marathon logo.](https://cdn.prod.website-files.com/6241c8c95eb4fa2f8a36e792/65952d134773365d155dc65f_belfast-city-marathon.webp)
![Garmin Health logo.](https://cdn.prod.website-files.com/6241c8c95eb4fa2f8a36e792/65952d133d1a441dd42cb3d2_garmin-health.webp)
![UK Run Chat logo.](https://cdn.prod.website-files.com/6241c8c95eb4fa2f8a36e792/65952d1323a5d80e347e14de_uk-run-chat.webp)
$17.99
$109.99
$19.99
$129.99
$17.99
$109.99
$17.99
$109.99
$17.99
$109.99
$17.99
$109.99
$17.99
$109.99
$19.99
$129.99
$29.99
$179.99
€19.99
€119.99
$17.99
$109.99
$19.99
$119.99
$19.99
$119.99
$19.99
$129.99
$19.99
$129.99
€19.99
€119.99
$17.99
$109.99
$17.99
$109.99
$17.99
$109.99
$17.99
$109.99
$17.99
$109.99
€19.99
€119.99
$17.99
$109.99
R$99.90
R$599.90
$17.99
$109.99
$17.99
$109.99
BGN 39.99
BGN 249.99
$17.99
$109.99
$19.99
$119.99
$19.99
$129.99
$24.99
$149.99
$17.99
$109.99
$17.99
$109.99
$17.99
$109.99
$17,990.00
$99,990
¥128.00
¥798
$99,900.00
$599,900
$17.99
$109.99
€19.99
€119.99
€19.99
€119.99
Kč 499.00
Kč 2,990.00
kr 149.00
kr 999
$17.99
$109.99
$17.99
$109.99
$17.99
$109.99
E£599.99
E£3,499.99
$17.99
$109.99
€19.99
€119.99
$17.99
$109.99
€19.99
€119.99
€19.99
€119.99
$17.99
$109.99
$17.99
$109.99
$19.99
$129.99
€19.99
€119.99
$19.99
$129.99
€19.99
€119.99
$17.99
$109.99
$17.99
$109.99
$17.99
$109.99
$17.99
$109.99
$17.99
$109.99
$148.00
$888
Ft 7,990.00
Ft 49,990
$19.99
$129.99
₹1,999.00
₹9,900.00
Rp 299,000.00
Rp 1,999,000
$17.99
$109.99
€19.99
€119.99
₪59.90
₪399.90
€19.99
€119.99
$17.99
$109.99
$17.99
$109.99
¥2,500.00
¥15,000
$17.99
$109.99
₸9,990.00
₸59,990
$19.99
$129.99
₩25,000
₩149,000
€19.99
€119.99
$17.99
$109.99
$19.99
$119.99
$17.99
$109.99
€19.99
€119.99
$17.99
$109.99
$17.99
$109.99
$17.99
$109.99
€19.99
€119.99
€19.99
€119.99
$17.99
$109.99
$17.99
$109.99
$17.99
$109.99
RM 79.90
RM 499.9
$17.99
$109.99
$17.99
$109.99
€19.99
€119.99
$17.99
$109.99
$17.99
$109.99
$399.00
$2,299
$17.99
$109.99
$19.99
$129.99
$19.99
$129.99
$17.99
$109.99
€19.99
€119.99
$17.99
$109.99
$17.99
$109.99
$17.99
$109.99
$17.99
$109.99
$17.99
$109.99
$17.99
$109.99
$17.99
$109.99
€19.99
€119.99
$29.99
$199.99
$17.99
$109.99
$17.99
$109.99
₦9,900.00
₦49,900
$17.99
$109.99
kr 229.00
kr 1,490
$17.99
$109.99
Rs 4,900.00
Rs 29,900
$17.99
$109.99
$17.99
$109.99
$17.99
$109.99
$17.99
$109.99
PEN 69.90
PEN 399.90
₱999.00
₱5,990.00
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
₽1 9,990
$17.99
$109.99
$17.99
$109.99
SAR 79.99
SAR 499.99
$17.99
$109.99
€19.99
€119.99
$17.99
$109.99
$17.99
$109.99
$24.98
$149.98
€19.99
€119.99
€19.99
€119.99
$17.99
$109.99
R 399.99
R 2,299.99
€19.99
€119.99
$17.99
$109.99
$17.99
$109.99
$17.99
$109.99
$17.99
$109.99
$17.99
$109.99
$17.99
$109.99
kr 229.00
kr 1,329.00
CHF 18.00
CHF 100.00
$590.00
$3,990
$19.99
$109.99
TZS 39,900.00
TZS 249,900.00
699.00
3,990.00
$17.99
$109.99
$17.99
$109.99
$17.99
$109.99
₺399.99
₺2,499.99
$17.99
$109.99
$17.99
$109.99
$19.99
$109.99
$19.99
$109.99
AED 69.99
AED 399.99
£15.99
£99.99
$17.99
$109.99
$17.99
$109.99
$19.99
$109.99
$17.99
$109.99
$17.99
$109.99
₫499,000
₫2,999,000
$17.99
$109.99
$17.99
$109.99
$19.99
$129.99