2026 Lost River Valley Calendar of Events
February - November 2026
Visitors Center, Loop Trail,
Caves & Dark Skies Reserve
18 Miles West of Arco - Highway 20/26/93
Visitors Information: (208)527-1335
may - Sept, 2026
Saturdays - Memorial Day to Labor Day
10:00AM - 2:00 PM
Bob Burroughs Park, Hwy 93, Mackay
Produce, Jams, Soap, Local Craftsman, Concessions & Live entertainment
Contact: Kacey Long (208) 727-7225
march 2026
Natural Spring Ice Easter Egg Hunt
Friday, April 3rd
Noon
Mackay Tourist Park
Contact: Stephanie Pehrson
(208) 390-1321
April 2026
Rocky Mountain Elk Foundation Dinner
Saturday, April 25th 5 PM
Mackay Fire Hall
Dinner, Silent & Live Auctions,
Raffles & Games
Contact: (800) 225-5355
may 2026
Mother's Day Craft & Gift Show
Saturday, May 2nd
10:00 - 3 PM
Lost River Firehouse, Mackay
Crafts, Gifts, & Food Vendors
Contact: Kasey Long
(208) 727-7225
May 2026
Arco High School Rodeo
Friday, May 1st
&
Saturday May 2nd
Butte County Fair Grounds, Arco
Contact: Amanda Beard (208) 569-1174
May, 2026
Mackay High School Rodeo
Friday, May 15th - 3 PM
&
Saturday May 10th - 8 AM
Mackay Rodeo Grounds
Contact: Crystal Roche (208) 313-3085
June, 2026
Moore Community Assoc. Golf Tournament
Saturday, June 13th
8 Am - 6 PM
River Park Golf Course, Mackay
Contact: Maddie Hansen (208) 869-3641
June, 2026
Mackay Rodeo
Friday June 26th - 5 PM
Saturday June 27th - 2 PM
Mackay Rodeo Grounds
For Information: mackayrodeoevent@gmail.com
June, 2026
Saturday June 27th 8 AM
Moore Idaho
50's Cars, Motorcycles, Antique Tractors
Contact: Arlene Pearson (208) 541-8412
or Maddie Hansen (208) 869-3641
July, 2026
34th Mackay Motorcycle Rally & Rodeo
Friday July 3rd - 5th
Mackay Tourist Park
Contact: Barry Huskey (208) 859-5975
Bridgette Severns (208) 703-3373
RodeoIMRA.org
July 2026
Mackay 4th of July Breakfast
Saturday July 4th - 7 AM - 10 AM
Mackay American Legion Hall
Contact: Stephanie Leavitt
(208) 3680-9105
July 2026
Mackay 4th of July Parade
Saturday July 4th - 10:30 AM
Mackay Main Street
Contact: Karen Hames
(208) 221-6814
July, 2026
Mackay 4th of July Celebration
Saturday, July 4th 11 AM - 2 PM
Kid's Park, Mackay
Games, Kids Trout Pond, Concessions
Contact: Jared Lambson (208) 533-4426
July, 2026
Mackay 4th of July Fireworks
Friday, July 4th
When it gets Dark
Mackay Reservoir
July, 2026
Arco 4th of July Parade & Picnic
Friday July 4th
11 AM
Arco Main Street
Contact: Shelley Blackner (208) 527-3021
July, 2026
Arco Moto Cross Races
Saturday, July 4th
2 PM
Arco Fair Grounds
Contact: Sandy Smith (208) 589-5161
July, 2026
Arco Atomic Days
9 AM - 4 PM
Friday, July 18th
Saturday, July 19th
Bottolfsen Park, Arco
Pancake Breakfast, Parade, Sports Tournaments & Live Entertainment
Contact: Shelley Blackner (208) 527-3021
August, 2026
Custer County Fair
July 27th - August 1st
Fairgrounds, Mackay
Contact: Sara Baker (208) 833-3179
Chris Holt (208) 569-2405
August, 2026
Butte County Fair
August 3-8th
Fair Grounds Arco
Contact: Sandy Smith (208) 589-5161
August, 2026
7th Annual Show & Shine Car Show
Saturday, August 15th
10 AM - 4 PM
Tank Park, Mackay
Collector Cars, Trucks, Motorcycles
Contact: Mick Hoover (208) 589-3109
August, 2026
Mackay Mini Rodeo
Saturday, August 15th
NOON
Mackay Rodeo Grounds
Kids up to 16 years of age
Contact: Kayla Hutchinson (208) 339-7896
August, 2026
Cowboy Church & Salmon river
Junior Rodeo Association Rodeo
Sunday, August 16th
Contact: Kayla Hutchinson (208) 339-7896
August, 2026
Wings Over Mackay
August 19th - 23rd
Planes, Warbirds, Helicopters
& Jet Turbine Aircraft
Mackay Airport
Demonstrations of Radio Controlled Aircraft, Drones
Contact: Jim Williams (208) 243-0504
Brian Diffendaffer (208) 917-10548
August, 2026
Wings Over Mackay Breakfast
Saturday, August 22nd
8 AM - Noon
Biscuits & Gray, Breakfast Burritos,
Breakfast Sandwiches, Coffee & Cocoa
Mackay Airport
Contact: Bob Bagley (208) 2588-2693
September, 2026
Saturday, September 16th
10 AM - 5 PM
Tourist Park, Mackay
Tons of Meat, Mackay's Treat
BBQ Beef Sandwiches, Vendors, Live Music & Entertainment
Contact: Mike Evans (208) 776-0578 or
Jim McKelvey (208) 390-2716
October, 2026
Mackay OktoberFest
Saturday, October 18th
Downtown Mackay Main Street
Fall Celebration
Contact: Stephanie Leavitt
(208) 3680-9105
october, 2026
Halloween Trick-or-Treat Walk
Saturday, October 31st
3 PM - 5 PM
Mackay Main Street
Local Businesses Treat Local Tricksters
Contact: Stephanie Leavitt
(208) 3680-9105
October, 2026
Hoover's House of Horrors
Saturday, October 31st
Rose Avenue - Mackay
Contact: Mick Hoover (208) 589-3109
November, 2026
Boo Boulevard & Fall Festival
Saturday, October 31st
Noon - 5:30 PM
Grand Avenue, Arco
Contact: Shelley Blackner (208) 527-3021
November, 2026
American Legion Dinner
Wednesday, November 11th
6:30 - 8:30 PM
Mackay American Legion Hall
Contact: Ron Oxley (208) 589-7889
November, 2026
Christmas Bazaar
Saturday, November 21st
10 AM - 4 PM
Mackay High School Gym
Christmas Gift Vendors
Contact: Trent Van Leuven (208) 369-3725
December, 2026
Mackay Annual Winter Fest
Saturday, December 12th
8 AM - 8 PM
American Legion Hall & Mackay Main Street
Christmas Celebration,
Breakfast with Santa,
Parade & Scavenger Hunt
Bob Bagley (208) 588-2693
November, 2026
Arco Festival of Trees
Friday November 20th
9 AM - 6 PM
Arco High School Gym
Contact: Mea Hayes (208) 589-9069
December, 2026
Moore Christmas Party
Saturday, December 16th
6 PM
Moore Community Center
Potluck
Contact: Maddie Hansen (208) 869-3641
