Lake trout anglers, it is time again! The 2026 Spring Mack Days Fishing Event on Flathead Lake will begin Thursday March 12th and will end on Saturday May 9th. Nine weeks of lake trout angling on one of the most beautiful spots in Montana, what could be better? Mack Days are sponsored by the Confederated Salish and Kootenai Tribes and are used as a fish conservation tool to reduce the non-native lake trout and increase the native bull trout and westslope cutthroat trout which are an important piece of the Flathead Lake system. Lake trout were introduced into the lake in 1905 and the increased populations of this predatory fish has put the native bull trout and westslope cutthroat populations at risk.
Lake trout numbers increased in the 1980’s when they discovered the mysis shrimp were a great food source and their population exploded. Numbers of the native fish dramatically declined lower than they had been for thousands of years. Now it is important to restore a better balance to the fish populations in Flathead Lake for the future of Montana’s native fish by reducing the number of non-native lake trout.
Lake trout anglers can fish Monday-Sunday with every lake trout entry giving them a chance in the lottery drawings that begin at $600 and go up to $2,000. Fish all of Flathead Lake! Prize amounts are different for Monday-Thursday and Friday-Sunday, check it out on the website.
Top twenty lake trout anglers receive cash prizes depending on their placing. Tagged lake trout are in all areas of the lake with values that begin at $10,000 (1), $5,000 (3), and $1,000 (5), and there are also more than 9,000 tagged fish with values from $100-$500. Bonus amounts are another way to win and are paid once the anglers total get to eleven lake trout and the categories go up every twenty-five fish. For example: 11-30 lake trout-$47, 31-50 $92, 101-125-$290, 301-325-$1017, and on up. Bonus amounts are paid for fish totals at the conclusion of the event.
These events were designed for everyone and there are different categories and prizes that are included-Ladies, Youth 12 & Under, 13-17 Youth, 70 & Over, Largest lake trout over 36”, and Smallest lake trout. Check out the different categories, rules, fishing videos and tips, fish ID, etc. at www.mackdays.com click on the events tab for the drop-down boxes of events.
Friday-Sunday fish pickup sites and times are listed on the website. Monday-Thursday all fish are to be turned in only at Blue Bay. There is a special fishing license rate for the south half of the lake that vendors who sell licenses have available for anyone-in-state or out that the Confederated Salish and Kootenai Tribes have provided.
Entries will be taken until the last day of the event. There is an entry page on the website under the events tab. Lake trout entries will even be taken at the end of the day after you come in after fishing. Entries are to be turned in the same day as caught. Please ice your fish. Anglers may keep their catch or turn them in to fisheries staff.
For information on boat inspections for those boats coming from out of the area or boats locally that have been on waters outside of the Flathead Basin telephone Montana FWP (406) 752-5501 or CSKT (406) 275-2700 ex 7261. Remember clean, drain, and dry. Be on the alert for any aquatic invasive species and always stop at boat checking stations.
It is important and it is an angler’s responsibility to know fish ID when out fishing. There is a fish ID page on the website or contact any Montana FWP or Tribal Fisheries office for information. Know how to ID a bull trout or westslope cutthroat. Those fish are to be returned into the lake as soon as caught. Also, any lake trout over 30” is to be released! The largest lake trout entry rules have changed and lake trout over 36” are to be released after measuring and verifying with a date stamped photo.
When handling a fish to return to the water remember to wet your hands before grabbing the fish. Have a way to lower it back into the water-fish that come up from the depths will have a distended stomach and need to burp to release the air. A fish descending device of some kind should be ready and on board your boat. There are ideas for making a fish descending device or sites to order a special made one online. It is also best to have separate coolers in a boat for each angler so any questionable catch is in that person’s cooler.
Everyone is encouraged to become weather wise when fishing on Flathead Lake. Montana weather changes happen fast and you have to be prepared. Have weather apps downloaded on your phone to have a place to check forecasts. Be sure to have safety equipment on board and use those life jackets and vests. They do no good if they are not on your back! Keep phones dry and let someone know your plans. Use good judgement out there when it comes to safety and be respectful of other anglers while fishing.
Bring your friends or family and make some good memories while fishing Mack Days Fishing Events. Have fun out there! Any questions or comments, please contact Cindy @ (406) 270-3386 or Joe @ (406) 274-0613.
Good luck and tight lines everyone!
—CSKT—
Photo: Tristan (2025) 38.25 inches 22.66 lbs. via CSKT