What to Pack for Your Fly Fishing Trip in Fort Smith, MT
Montana weather is as wild and beautiful as the rivers that run through it. If you’re planning a fly fishing trip to Fort Smith, MT, home of the legendary Bighorn River, packing the right gear is just as important as picking the right fly.
At RSO Outfitters, we guide clients year-round through every season Montana throws our way. And if there’s one thing we’ve learned after decades of guiding on the Bighorn, it’s this: the weather changes fast. A calm spring morning can turn windy by noon. A sunny fall afternoon can cool down the moment the sun dips behind the canyon wall. Being prepared is the key to staying comfortable—and catching fish.
Whether you’re visiting in April or October, here’s your complete guide to what fishing gear to pack for Montana weather, based on the real-world experience of Fort Smith guides.
A Quick Overview of Fort Smith’s Weather by Season
Spring (March–May):
- Variable weather: snow, rain, wind, and sunshine—all possible in a single day
- Cold mornings, warming afternoons
- Some of the best early-season nymph fishing on the Bighorn
Summer (June–August):
- Warm to hot days, cool mornings and evenings
- Afternoon thunderstorms are common
- Prime time for dry fly fishing and full-day floats
Fall (September–November):
- Crisp mornings, mild days, chilly evenings
- Gorgeous foliage and lower fishing pressure
- Big fish hunting with streamers and dry-dropper rigs
Winter (December–February):
- Cold, often below freezing
- Consistent water temps below the Yellowtail Dam make winter fishing viable
- Low pressure, technical fishing conditions for hardy anglers
Layering Is the Secret Weapon
Montana’s weather changes often—and quickly. The best way to stay comfortable is to dress in layers so you can adapt to the conditions without missing time on the water.
Base Layer: Moisture Management
- Synthetic or merino wool long underwear (top & bottom)
- Avoid cotton—it absorbs sweat and holds cold
Mid Layer: Insulation
- Fleece jacket or pullover
- Down or synthetic insulated vest or puffy jacket (especially in spring/fall)
Outer Layer: Protection from the Elements
- Waterproof, breathable rain jacket with a hood
- Windproof softshell or shell pants (if not using waders all day)
Pro Tip: Even in July, bring an extra layer. Mornings on the river can feel 20–30°F cooler than town.
Must-Have Fishing Gear for Fort Smith
1. Waders & Boots
On the Bighorn River, you’ll spend time both in the boat and occasionally wading prime runs. Breathable waders with built-in gravel guards are a must for all but the hottest days.
- Waders: Breathable and durable (Simms, Orvis, Patagonia are popular brands)
- Boots: Felt-soled or rubber with studs (check local regulations on felt)
- Socks: Wool or synthetic (bring a spare pair just in case)
2. Rods & Reels
We provide gear on all guided fly fishing trips, but if you’re bringing your own, here’s what works well:
- Rod: 5- or 6-weight, 9’ fly rod for trout
- Reel: Large arbor with a smooth drag system
- Line: Weight-forward floating line with options for sinking leaders if streamer fishing
Bonus: Bring a second rod if you want to quickly switch between nymphing and dries without re-rigging.
Accessories That Make a Big Difference
Polarized Sunglasses
Essential for spotting fish, reducing glare, and protecting your eyes from errant casts. Amber or copper lenses work well in most Montana light conditions.
Hat
Wide-brimmed hat or ball cap for sun protection. In spring and fall, a warm beanie is also a must-have.
Gloves
Fingerless fleece gloves in colder months allow you to stay warm while tying knots and handling fish.
Buff or Neck Gaiter
Protects from wind, sun, and even insects. Also keeps you warm in the morning and cool in the afternoon.
Sunscreen & Lip Balm
Yes, even in spring and fall. Montana sun at altitude can burn you faster than you think.
Fishing Pack or Vest
Bring your flies, leaders, tippet, indicators, nippers, and floatant in something that’s easy to access and water-resistant.
Flies & Terminal Tackle
Guides will have everything you need, but if you’re building your own box, here’s what works well on the Bighorn River in Fort Smith:
Spring
- Midges, baetis, and sow bugs
- Zebra midge, Ray Charles, Pheasant Tail
- Soft hackles and small streamers
Summer
- PMDs, caddis, terrestrials (hoppers, ants, beetles)
- Dry-dropper rigs with smaller nymphs
Fall
- Baetis, tricos, hoppers early in the season
- Streamers for big browns (olive, black, white)
- Split-case nymphs, RS2s, and soft hackles
Tip: Bring plenty of 5x and 6x tippet in the summer for dry fly fishing and 4x for nymphing year-round.
Extra Comforts for a Full Day on the River
- Dry Bag: For spare layers, electronics, and personal items
- Snacks & Water: We provide lunch on full-day floats, but feel free to bring your favorite high-protein snacks
- Camera or GoPro: For capturing that first (or fiftieth) Montana trout
- Reusable Water Bottle: Stay hydrated even when it’s cold
Nature & Weather Considerations
Montana’s natural beauty is part of what makes it unforgettable. Keep an eye out for:
- Bald eagles nesting along the cliffs
- White-tailed deer and wild turkeys near the river
- Osprey, herons, and other birdlife
Weather shifts can come on fast. Clouds might bring rain or wind, but they often also bring excellent fishing conditions—especially for dry fly anglers. That’s why being dressed properly and packing a few comfort items can make or break your day.
RSO Pre-Trip Checklist
Here’s a quick rundown you can copy or screenshot:
✔️ Waders and boots
✔️ Layered clothing system
✔️ Waterproof rain jacket
✔️ Polarized sunglasses
✔️ Hat + Buff
✔️ Gloves (early and late season)
✔️ Fishing pack or vest
✔️ Sunscreen and lip balm
✔️ Water bottle and snacks
✔️ Camera or GoPro
✔️ Valid Montana fishing license
✔️ Rod, reel, and fly box (optional—we’ll provide if needed)
Final Thoughts: Be Ready for Anything
Montana weather doesn’t follow a script—but that’s part of the fun. When you pack right, you’re free to enjoy everything Fort Smith and the Bighorn River have to offer without worrying about comfort or performance.
At RSO Outfitters, we’re here to guide you every step of the way. Whether it’s your first float trip or your tenth, we’ll help you gear up, get dialed in, and make the most of your time on the river.
Book Your Fort Smith Fly Fishing Trip Today
Looking for an unforgettable adventure on one of Montana’s most iconic trout rivers? Contact RSO Outfitters to book your next guided fly fishing trip in Fort Smith, MT.
We’ll bring the expertise—you bring the excitement. Contact Us
