What Lake Frances Offers

Lake Frances is a small alpine lake in the Beartooth Mountains of south-central Montana, sitting at roughly 9,000 feet elevation. It holds cutthroat trout and brook trout, with cutthroat being the native species and the primary draw for fly anglers. The lake is accessible by foot trail only, making it a destination for backpackers and day hikers willing to climb for solitude and clear water.

The lake itself is shallow to moderate in depth, with rocky shoreline and subalpine meadow surrounding it. Water clarity is typically good, and the setting is stark and open — you are above treeline or near it, depending on the exact approach. This means weather changes fast and afternoon thunderstorms are common in summer. The fishing window is short: the lake is usually ice-free from mid-July through September, with peak conditions in August.

Key Takeaways

  • Lake Frances holds native cutthroat trout and introduced brook trout, with cutthroat being the primary target for most anglers.
  • Access is by foot trail only, typically a 4- to 6-mile hike depending on your trailhead, so plan for a full day or overnight trip.
  • The lake sits above 9,000 feet in the Beartooth Mountains, so weather is unpredictable and afternoon thunderstorms are routine in July and August.
  • Fly fishing is the most effective method; small dry flies and nymphs work well on cutthroat that have not seen heavy pressure.
  • Montana fishing license and a Beartooth Plateau Conservation Permit are required; check current regulations for any species-specific rules before you go.

How to Reach Lake Frances

Lake Frances is accessed via the Beartooth Plateau trail system, most commonly from the Beartooth Highway (US 212) between Red Lodge and Cooke City. The most direct approach is from the Island Lake trailhead, which sits at roughly 9,600 feet and requires a 4- to 6-mile hike depending on which route you take and where you park. Parking at the trailhead fills quickly on weekends in July and August, so arrive early or plan a weekday trip.

The trail itself is well-marked but exposed. There is little shelter, and the terrain is rocky alpine meadow with scattered stunted conifers. Elevation gain is modest if you start at Island Lake, but the altitude and wind make the hike feel harder than the distance suggests. Bring water, sun protection, and a jacket even on clear mornings — conditions change in minutes at this elevation.

If you are backpacking, campsites exist near the lake but are limited and heavily used. Camp at least 100 feet from the water and pack out all waste. Day hiking is feasible for anglers in reasonable shape; the round trip takes 8 to 10 hours depending on pace and how long you fish.

Cutthroat and Brook Trout Behavior at Lake Frances

Cutthroat trout in Lake Frances are the native species and typically range from 8 to 14 inches, with occasional fish to 16 inches. They are less wary than cutthroat in heavily fished lower-elevation lakes, partly because the lake sees fewer anglers and partly because the short season means less cumulative pressure. They feed actively on small aquatic insects and will rise to dry flies, especially in early morning and late afternoon.

Brook trout are also present and tend to be slightly larger on average, but they are not the target species here — the lake's conservation value lies in the cutthroat population. Brook trout are aggressive and will take nymphs and small streamers readily, so if you hook a brookie, it is usually a bonus rather than a disappointment.

Insect hatches at this elevation are limited compared to lower lakes. Midges are present year-round, and small mayflies emerge in late July and August. Caddisflies are less abundant. Fish the first two hours after sunrise and the last two hours before sunset for the most consistent action; midday fishing is often slow.

Tackle and Techniques That Work

A 4-weight or 5-weight fly rod is ideal for Lake Frances. The water is clear, the fish are not large, and the wind at altitude can make casting difficult — a lighter rod is easier to manage in gusts. Bring a floating line and a sink-tip or intermediate line if you want to fish deeper; most of your time will be on the surface or in the top few feet.

Dry flies in sizes 16 to 20 work well: small Adams, Parachute Adams, Griffith's Gnat, and Pale Morning Dun patterns all produce. Nymphs are equally effective, especially Pheasant Tail and Hare's Ear in sizes 16 to 18. Small streamers (size 10 to 12) will draw strikes from brook trout and larger cutthroat, but they are not necessary for consistent fishing.

Fish the shoreline and any visible structure — rocks, drop-offs, weed beds. The lake is small enough that you can cover most of it in a day. Wade carefully; the bottom is rocky and uneven, and the water is cold even in August. Wear a wading belt and consider a wading staff for stability.

Seasons and Weather Patterns

Lake Frances is fishable from mid-July through September, with August typically offering the most stable weather and warmest water. July can still have snow patches near the lake, and early-season water is very cold — fish are active but the lake may not be fully accessible until late in the month. September brings shorter days and colder nights, but the fishing remains good and crowds thin considerably.

Afternoon thunderstorms are common from July through August, especially between 2 and 5 p.m. These storms can be intense and dangerous at altitude. Plan to be off the water and off exposed ridges by early afternoon. Morning fishing is more reliable and often more productive anyway.

Wind is nearly constant, especially in the afternoon. Early morning is calmer, which is another reason to start your hike before dawn if you are day fishing. Bring a windproof jacket and be prepared for temperatures in the 40s even in August.

Regulations and Permits

A valid Montana fishing license is required. A Beartooth Plateau Conservation Permit is also required for fishing in this area; it is separate from the standard license and can be purchased at sporting goods stores in Red Lodge or online through the Montana Fish, Wildlife & Parks website.

Check current regulations for cutthroat and brook trout before you fish. Montana occasionally adjusts harvest limits or species-specific rules on alpine lakes to protect native cutthroat populations. Some lakes have catch-and-release-only rules for cutthroat, while others allow harvest. The regulations are posted on the FWP website and at the trailhead.

Pack out all trash, including spent fly line and leader. The alpine environment is fragile and recovers slowly from damage. Camp only in designated areas if backpacking, and use a camp stove rather than a fire.

When to Fish Lake Frances and What to Expect

Mid-August is the sweet spot: weather is most stable, the lake is fully accessible, and fish are feeding actively. July offers solitude and good fishing if you are comfortable with cold water and unpredictable weather. September is excellent for anglers who want fewer crowds and do not mind shorter days and colder nights.

Expect to catch 10 to 20 fish in a full day of fishing if conditions are favorable and you are competent with a fly rod. Some days will be slower, especially if wind is strong or afternoon storms move in early. The lake is not a numbers fishery; it is a place to fish clear water for native cutthroat in a remote alpine setting.

Solitude is the real draw. You may see other anglers, especially on weekends, but the lake never feels crowded. The view of the Beartooth peaks and the sound of wind across the plateau are part of the experience.

Frequently Asked Questions

Can I reach Lake Frances as a day trip from Red Lodge?

Yes. The drive from Red Lodge to the Island Lake trailhead is about 45 minutes, and the hike is 4 to 6 miles each way. A full day trip means leaving before dawn, hiking in, fishing for 4 to 6 hours, and hiking out before dark. It is doable but tiring; many anglers prefer to backpack and fish over two days.

What is the cutthroat size at Lake Frances?

Most cutthroat run 8 to 14 inches, with occasional fish to 16 inches. They are not large, but they are willing to take flies and the setting makes up for the modest size. Brook trout average slightly larger but are not the target species.

Do I need a guide to fish Lake Frances?

No. The trail is well-marked, the lake is straightforward to find, and the fishing does not require specialized knowledge. If you are new to fly fishing or alpine hiking, a guide can make the trip more enjoyable and safer, but it is not necessary.

What if the weather turns bad while I am hiking?

Turn back. Afternoon thunderstorms at altitude are dangerous, and the terrain offers little shelter. If you are caught in a storm, avoid ridges and isolated high points, crouch low (do not lie flat), and wait it out. Plan your hike to be off exposed terrain by early afternoon.

Can I fish Lake Frances in June or October?

The lake is usually still frozen or just melting in June, making access difficult and fishing poor. October is possible but the lake may be freezing over, nights are very cold, and weather is unpredictable. July through September is the reliable window.