The Monster Cat Roundup was started in 2009 by Montana Cats board of director Steve Harris. This BOAT ONLY tournament is held annually on the 3rd Saturday of July on the beautiful Yellowstone River. Tournament headquarters are stationed out of the Sidney Bridge in Sidney, MT. Boundaries stretch from the Montana – North Dakota state line to Intake Diversion Dam. The event is limited to the first 60-boats entered and it continues to fill up on an annual basis. The Roundup is unique in that it offers river-side weigh-ins and a sandy beach for every boat to rest comfortably before and after the competition. The Ranger Lounge in downtown Sidney hosts the pre and post-tournament festivities for this event. Steve, and his wife Ashley, are the current tournament directors.
Become a fan of the Monster Cat Roundup on Facebook and get instant updates on all tournament news.
Registration for the 17th Annual Monster Cat Roundup in Sidney, MT on July 19th 2025 is NOW OPEN.
See tournament rules, regulations and PDF mail in entry HERE.
| 2009 | Chad Dawson, Lars Sorensen | 23.90 lbs |
| 2010 | Brenner Flaten, Nate Molstad | 19.28 lbs |
| 2011 | Justin King, Jeremiah Hopstad | 36.44 lbs |
| 2012 | Brenner Flaten, Chad Dawson | 36.79 lbs |
| 2013 | Bobby Wise, Robert Wise | 38.36 lbs |
| 2014 | Brady Mueller, Joe Carpenter | 26.76 lbs |
| 2015 | Bobby Wise, Robert Wise | 36.00 lbs |
| 2016 | Matt Reynolds, Carrie Niblock | 32.17 lbs |
| 2017 | Rod Seder, Rob Seder | 23.06 lbs |
| 2018 | KaCee McPherson, Nicole Peterson | 33.28 lbs |
| 2019 | Chase Hagler, Garett Leuenberger | 38.25 lbs |
| 2020 | KaCee McPherson, Nicole Peterson | 31.75 lbs. |
| 2021 | Brenner Flaten, Chad Dawson | 25.75 lbs. |
| 2022 | Cole Plouffe, Brett Burman | 37.80 lbs. |
| 2023 | Todd Lindsay, JJ Lindsay | 37.03 lbs. |
| 2024 | Pete Bushman, Nate Lyman | 33.50 lbs. |
| 2009 | Kyle Mueller | 10.30 lbs | Big Fish Award |
| 2009 | Lars Sorensen | 7.70 lbs | Second Big Fish Award |
| 2010 | Brady Mueller | 7.66 lbs | Big Fish Award |
| 2010 | Sam Syth | 6.19 lbs | Second Big Fish Award |
| 2011 | Kenny Erickson | 10.52 lbs | Big Fish Award |
| 2011 | Jeremiah Hopstad | 10.16 lbs | Second Biggest Fish Award |
| 2012 | Lauren Dempsey | 10.96 lbs | Big Fish Award |
| 2012 | Brenner Flaten | 10.80 lbs | Second Biggest Fish Award |
| 2013 | Terry Decker | 11.01 lbs | Big Fish Award |
| 2013 | Brady Mueller | 10.85 lbs | Second Biggest Fish Award |
| 2014 | Donny Dillman | 9.60 lbs | Big Fish Award |
| 2014 | Brady Mueller | 9.43 lbs | Second Biggest Fish Award |
| 2015 | Bobby Wise | 10.20 lbs | Big Fish Award |
| 2015 | Joe Carpenter | 8.71 lbs | Second Biggest Fish Award |
| 2016 | Matt Reynolds | 8.85 lbs | Big Fish Award |
| 2016 | Chad Nelson | 8.33 lbs | Second Biggest Fish Award |
| 2017 | Randy Franco | 10.00 lbs | Big Fish Award |
| 2017 | James Decker | 8.61 lbs | Second Biggest Fish Award |
| 2018 | Lindsey Gauer | 11.63 lbs | Big Fish Award |
| 2018 | Brady Flaten | 11.08 lbs | Second Biggest Fish Award |
| 2019 | Chase Hagler | 9.68 lbs | Big Fish Award |
| 2019 | Chase Hagler | 9.38 lbs | Second Biggest Fish Award |
| 2020 | Nicole Peterson | 16.02 lbs | Big Fish Award |
| 2020 | Trevor Gust | 9.26 lbs | Second Biggest Fish Award |
| 2021 | Sara Schwenk | 11.04 lbs | Big Fish Award |
| 2021 | Josh Marottek | 8.41 lbs | Second Biggest Fish Award |
| 2022 | Brenner Flaten | 11.55 lbs. | Big Fish Award |
| 2022 | Brett Burman | 10.09 lbs. | Second Biggest Fish Award |
| 2023 | Todd Lindsay | 11.08 lbs. | Big Fish Award |
| 2023 | Todd Lindsay | 9.14 lbs. | Second Biggest Fish Award |
| 2024 | Pete Bushman | 12.86 lbs. | Big Fish Award |
| 2024 | Danielle Linder | 11.79 lbs. | Second Biggest Fish Award |
If you're interested in being a Monster Cat Roundup sponsor please contact, Steve Harris, at (406) 489-1170 or Ashley Harris, at 406-489-0673.
