Choose from 1) LIVE 5K Run/Walk 2) LIVE 10K Run 3) VIRTUAL (Pick your distance, date and location)

Live races starts at 10 am

ONLINE REGISTRATION CLOSES Wednesday March 25th at 12 pm, after that time you can only register in person on race day between 8:30 am and 9:30 am. Raceday registrations will be $45 for either distance.

T-Shirts not guaranteed if not registered by March 10th at Midnight, there will not be a second shirt order.

Join Missouri River Runners for $15 for your entire household yearly membership (Jan 1 thru Dec 31, 2026).  Get $5 off EACH Spring Thaw 2026 race entry for your family!
Please register here first before completing your race entries:  http://getmeregistered.com/MRR

Note:  All membership discounts will be verified prior to picking up your packet.  No race entry transfers or refunds.

Peak Performance Packet Pickup: March 27th (Friday) 12 pm - 6 pm. (Peak Performance is located at 4501 Southern Hills Dr, Suite 19, Sioux City. Race Day (Saturday, March 28th) Packet Pickup:  8:30 am - 9:45 am The Hilton Garden Inn Sioux City Riverfront Lobby at 1132 Larsen Park Rd, Sioux City, IA.   VIRTUAL PARTICIPANTS:  
Run or walk your distance anywhere and anytime you choose trail, sidewalk or treadmill!  (Be sure to follow runner safety!)

After running, post a photo or video and share your virtual race experience on Missouri River Runner social media.

Race Day Packet pickup, post-race refreshments and Post Race Awards will be inside the The Hilton Garden Inn Sioux City Riverfront at 1132 Larsen Park Rd in Sioux City.

Overall Awards and age group medal winners will be presented for the LIVE Events only.

Overall Male, Overall Female, Masters Male, Masters Female

Age Group Categories:
14 & Under, 15-19, 20-24, 25-29, 30-34, 35-39, 40-44, 45-49, 50-54, 55-59, 60-64, 65-69, 70 & Over

Links to results will be posted on Facebook and www.missouririverrunners.com/?event=spring-thaw

Please share your pictures and videos on Missouri River Runners social media!

For event-related questions, please click on the Contact the Organizers button on the left-hand side of this page.