Inside Glacier National Park’s boundaries, you do not need a state fishing license. However, there are important exceptions along the park’s boundary rivers. If you fish the Middle Fork of the Flathead River from park lands or bridges, you do need a Montana fishing license and must follow state regulations. On the North Fork of the Flathead River, state limits and methods apply; you won’t need a state license when fishing from park lands, but you should still know Montana’s rules and limits. (National Park Service)
If you plan to fish outside the park or on state-managed waters, buy a Montana license and check that year’s regulations with Montana Fish, Wildlife & Parks. Their online regulations and licensing pages outline districts, exceptions, and how to purchase (including non-resident options). (Montana FWP)
Image Credit: Roger Hall
Seasons at a Glance
Glacier’s standard fishing season for most waters runs from the third Saturday in May through November 30. There are key carve-outs: lake fishing is open year-round, and several waters have special closures or different rules to protect spawning fish and reduce bear conflicts. Notable examples include a seasonal closure at Hidden Lake outlet (usually much of July) and a spring closure near the Bowman Lake Ranger Station from May 1–June 15. Always check the “Closed Waters” and “Season and Limits” sections before you go. (National Park Service)
Know the “Closed Waters”
Some streams and lakes are completely closed to fishing to protect sensitive habitats and native fish. Among them: Upper Kintla Lake, Akokala Lake, Cracker Lake, North Fork of the Belly River, sections of Kintla, Bowman, and Logging Creeks, and a set of creeks closed for their entire length (including Ole, Park, Coal, Nyack, Fish, Lee, Otatso, Boulder, and Kennedy Creeks). There’s also a buffer on the North Fork of the Flathead near the mouth of Big Creek. These closures are precise—check the park page for the full list and map references before you venture in with a rod. (National Park Service)
What You Can (and can’t) Keep
Glacier prioritizes native fish conservation. All native fish must be released immediately and unharmed. Native species include bull trout and westslope cutthroat trout (among others). In contrast, the park encourages removal of non-native species—there’s no daily catch or possession limit on non-natives in most park waters. One key nuance: St. Mary Lake allows limited harvest of certain native species under a combined five-fish daily/possession total with species-specific caps; bull trout must still be released. If in doubt about what you’ve caught, remember: “If you don’t know, let it go”. (National Park Service)
Because native and non-native trout can look similar, take time to learn the field marks: cutthroat’s throat slash; bull trout’s pale back spots and pink/orange side spots; lake trout’s forked tail; brook trout’s blue-halo red spots. The park offers an ID brochure at all visitor centers—well worth picking up before you cast. (National Park Service)
Tackle, Bait, and Gear Rules
Glacier is mostly artificials-only: only artificial flies and lures are permitted. There are limited exceptions where bait is allowed (e.g., Two Medicine drainage upstream of the Two Medicine bridge at the Running Eagle Falls parking lot, and in Many Glacier Valley upstream of the falls at the outlet of Swiftcurrent Lake). One rod per person, and you must keep it closely attended. Snagging is prohibited. The park also bans felt-soled wading boots (to slow the spread of aquatic invasive species) and prohibits lead in any form of fishing tackle—with one exception: downrigger users may employ 2-pound-or-heavier “cannonball” lead weights on the downrigger cable. On the North and Middle Forks of the Flathead, treble hooks are prohibited. (National Park Service)
Boats, Permits, and Invasive Species Checks
If you’ll be fishing from a boat (including kayaks and float tubes), plan ahead. Every watercraft must pass an Aquatic Invasive Species (AIS) inspection before launching in park waters. You’ll find inspection sites and hours on the park’s boating page. Even if you wade only, clean, drain, and dry everything—waders, boots, nets, and lines—before entering Glacier waters. AIS like zebra/quagga mussels and whirling disease can devastate native fisheries; be aware the park takes this seriously. (National Park Service)
Special Boundary Waters You Should Understand
Flathead Rivers (North & Middle Forks): These particular rivers form Glacier’s western and southern boundaries, and the rules change with jurisdiction. As noted above, a Montana fishing license is required on the Middle Fork from park lands or bridges. On the North Fork, park catch/possession limits and state methods apply, but no state license is required when fishing from park lands. Always verify current Montana FWP regulations (district rules, and seasonal exceptions) before you go. (National Park Service)
Waterton Lake: Regulations on Waterton Lake (shared with Waterton Lakes National Park, Canada) align with Parks Canada rules. If you cross into Canadian waters or fish on the Canadian side, you’ll need a Parks Canada fishing permit, not a provincial license, and you must follow their seasons and restrictions. (National Park Service)
Lower Two Medicine Lake: Portions of Lower Two Medicine fall under the Blackfeet Nation. Seasons, catch, and possession limits there are set by the Tribe. If you intend to fish those parts, consult the Blackfeet Fish & Wildlife office for current rules and permit requirements. (National Park Service)
Ethical Fish Handling (and staying bear-smart)
Even when a fish is legal to harvest, Glacier’s ethic is “fish for fun, not food.” When releasing fish, wet your hands first, keep the fish in the water, minimize handling, and let it go promptly. The park also has strict rules for cleaning fish: use trash cans where available; otherwise, puncture the air bladder and drop entrails into deep water at least 200 feet from campsites or trails. Don’t bury or burn entrails—they attract bears. Keep skin on any harvested fish until you leave the park so rangers can verify species. (National Park Service)
About those bears: both black and grizzly bears live here. Make noise when you hike to fishing spots, never approach wildlife, and secure food and fish at all times. If you see bear activity concentrated around spawning areas (e.g., cutthroat in July), give it space—some closures, like the Hidden Lake outlet, exist specifically to reduce bear–human conflict during runs. (National Park Service)
Ice Fishing Rules (for the hardy)
If you’re planning a winter trip, Glacier allows ice fishing on many lakes, but with tight restrictions: no motorized vehicles on any lake or stream, no power augers, no open fires, and no unattended shelters or gear. Camp only in designated sites; keep human waste well away from the water and pack out all toilet paper. (National Park Service)
Practical Trip-planning Tips
1) Check current closures and alerts. Seasonal and species-protection closures change based on conditions. Always review the park’s Fishing page and Alerts before you go and then recheck right before you drive to the trailhead. (National Park Service)
2) Decide where you’ll be standing. On the Flathead forks, whether you need a Montana license can hinge on where your boots are (park lands vs. state side) and which fork you’re on. When in doubt, carry a Montana license—and know the district rules. (National Park Service)
3) Learn your trout. Being able to instantly distinguish bull and cutthroat from brook and lake trout will save fish—and you—from trouble. Carry a pocket ID guide or snap photos for later, but if you’re unsure in the moment, release immediately. (National Park Service)
4) Prep your gear to pass inspection. Show up with boats clean, drained, and dry; leave felt soles at home; swap any lead tackle for non-lead alternatives; and if you troll with downriggers, bring legal-weight cannonballs for the cable. (National Park Service)
5) Respect other jurisdictions. Crossing into Canadian waters on Waterton Lake brings Parks Canada rules and permits into play. Fishing the tribal side of Lower Two Medicine invokes Blackfeet Nation rules. Plan for the paperwork and seasons before you cast. (National Park Service)
A Note on Conservation and Why these Rules Matter
Glacier’s fish story is a tale of two lineages: native cold-water species (bull trout, westslope cutthroat) that evolved here, and a slate of non-natives introduced over the past century. Harvest-friendly rules for non-natives and strict protection for natives reflect a simple goal—keep native fish on the landscape. Combined with AIS inspections, bans on felt soles and lead, and carefully timed closures, these rules are designed to maintain clean water, healthy habitats, and safer encounters for anglers and wildlife alike. (National Park Service)
Quick Reference (print for later)
- License: Not required inside Glacier except Middle Fork (license required). North Fork follows state methods/limits; no state license needed from park lands. (National Park Service)
- Season: Most waters third Saturday in May to Nov 30; lakes open year-round; see special closures. (National Park Service)
- Keep/Release: Release all native fish (e.g., bull trout, westslope cutthroat). No limits on non-natives; St. Mary Lake has special combined limits for some native species. (National Park Service)
- Tackle: Artificial flies/lures only (with limited drainage-specific bait exceptions). One rod, attended. Treble hooks banned on North & Middle Forks. No felt soles. No lead tackle (downrigger cannonballs ≥ 2 lb allowed). (National Park Service)
- Boats/AIS: AIS inspection required before launching any craft. Clean, drain, dry everything. (National Park Service)
- Special jurisdictions: Waterton Lake follows Parks Canada (permit required on the Canadian side). Lower Two Medicine rules set by the Blackfeet Nation. Check before you fish. (National Park Service)
- Montana Freshwater Fishes (Pocket Naturalist® Guide)