When people around the Tobacco Valley say they're waiting for the tamaracks, which tamaracks do they mean?
Eureka sits between two larch seasons. Western larch fills the valley bottoms and lower slopes along Lake Koocanusa and US 93. Alpine larch grows in pure stands up in the Ten Lakes Scenic Area. The two species don't keep the same schedule. A Distinctly Montana fall foliage guide says the high-country trees "exhibit peak color up to one month before their lowland cousins," and western larch usually peaks sometime in the second half of October.
That gap of up to a month changes how October works here. The high trip and the low trip are different outings, each running on its own calendar of roads, closures and seasons. Plan for one "larch weekend" and you can easily catch one wave and miss the other.
The High Wave Runs on Weather, Not Staffing
The Kootenai National Forest puts the Ten Lakes Scenic Area about 20 miles off US 93 near Eureka, reached by Forest Roads 114 and 319. The forest calls out its uncommon alpine larch and names the Therriault Lakes and Bluebird Basin as its scenic highlights. The Distinctly Montana guide is more specific. It places pure alpine larch stands about a mile north of Bluebird Lake on the Ten Lakes Loop trail.
The guide also says why so few people see those trees in color. Alpine larch tends to peak around the same time aspens peak in Glacier National Park, so "few people, except for hikers and backpackers," get to see it. On the Eureka side, that means the high window can be open right now, in the first days of October, while much of the valley is still green.
The trails were in good shape for summer. The Forest Service's 2026 trail report shows the Big and Little Therriault Lake loops cleared June 25, Robinson Mountain June 26, Bluebird June 30 and Wolverine Lakes July 1. Those are summer clearing dates, though. They don't describe conditions this week.
The bigger change is who is minding the trailheads. The Forest Service manages Big Therriault Lake Campground June 29 through September 8 and Little Therriault June 29 through Labor Day. Both pages say the sites can be reached year-round when weather permits. So in October you can still get in, but you're on your own, and the weather decides whether the road works.
As of early October, the Kootenai's alerts page doesn't list a closure on Grave Creek Road #114 or Therriault Lakes Road #319. It does show the Fortine Ranger District closing Deep Creek Road #368 starting September 24, 2026, which is a reminder that the list changes during the season. The Ten Lakes page sends visitors to trailhead bulletins and the Eureka Ranger Station for current information. The Rexford/Fortine Ranger District number is 406-296-2536.
The Low Wave Shares October With Hunting Season
Western larch in the valley usually peaks in the second half of October. That's the same stretch when the woods around Eureka get much busier with hunters.
Montana FWP's 2026 deer and elk seasons look like this:
- Archery: September 5 through October 18
- Youth, deer only: October 15 and 16
- General season: October 24 through November 29
Put those next to the larch timing. The first half of the low wave overlaps the last days of archery and the youth weekend. The back half, which is often the best color, falls after the October 24 general opener. That applies to trails like Robinson Mountain as much as to the forest roads off MT 37. Seeing larch in the high country before the opener means going while the alpine trees are turning. Seeing the valley at its peak means sharing it with general-season hunters.
None of this is a reason to skip either trip. It's a reason to pick your dates on purpose instead of waiting for color to show up in town.
What Koocanusa Looks Like When the Valley Turns
The Forest Service describes the Koocanusa area's fall drives as especially worthwhile when the western larch changes color. The Distinctly Montana guide lays out a 225-mile loop: Highway 2 from Kalispell to Libby, the Lake Koocanusa Scenic Byway on MT 37 north to Eureka, then US 93 south. It names Highway 2 between mile markers 85 and 55 as the most photogenic stretch, where larch is spaced so evenly among the other conifers that it looks like a checkerboard.
MT 37 should be an easier drive than it was this summer. The Montana Department of Transportation's construction report from the evening of October 3 lists work at seven MT 37 locations as completed, at mileposts 13.8, 23.3, 29.4, 34.1, 37.9, 48.5 and 63.9.
The lake will look lower than it did in summer. The U.S. Army Corps of Engineers recorded Lake Koocanusa at 2,444.09 feet at 10 p.m. on October 4. Full pool on the Corps' Libby Dam fact sheet is 2,459 feet, so the reservoir is about 14.9 feet below full. Expect wider shorelines below the larch on the byway than the July version of this drive had.
Rexford Bench is in the middle of a rebuild. The Forest Service is replacing the 50-year-old water and wastewater system there, which it calls "one of the largest and most popular recreation sites on the forest." The beach and recreation area above the high-water mark is closed, including the picnic tables, flush restrooms and footbridge. Overflow parking at Kamloops is also closed. These stay open, according to the closure notice:
The sand area below the high-water mark, adjacent to the boat launch, is accessible for swimming and water access. The boat launch is open and accessible. Camping at the main Rexford Bench and Kamloops Terrace remains open. Rails to Trails (NFS Trail #255) is open. Water and dump station services remain available.
Construction runs Monday through Friday only, with no active work on weekends. The two end dates disagree. The alert says the closure lasts until October 30, 2026, unless work wraps up sooner. The signed forest order runs through October 31. Either way, the full Rexford Bench site likely won't reopen until the valley's larch is past its typical peak.
October Around Eureka, in Order
Here are both waves and the calendars around them, laid out by date:
- Now, early October: The high-country window. Alpine larch near Bluebird Lake and the Therriault Lakes can peak up to a month ahead of the valley. Campgrounds have been unstaffed since early September, and access depends on the weather.
- October 15 and 16: FWP's youth deer-only season.
- October 18: Deer and elk archery season ends.
- Second half of October: Western larch typically peaks along MT 37, US 93 and the lower slopes.
- October 24: The general deer and elk season opens and runs through November 29.
- October 30 or 31: The Rexford Bench beach-area closure is set to end, unless work finishes sooner.
The order is the plan. Go high first, while the alpine trees are turning. Save the valley for later in the month, and know which hunting season it overlaps.
Closer to Town, Between the Big Days
Not every larch outing needs a forest road. The Eureka Riverwalk follows the Tobacco River and is open all year to walkers, joggers, cyclists and wheelchair users. One travel listing describes it as a flat, paved, two-mile round trip starting at the southeast corner of the Tobacco Valley Historical Village. The Village grounds are open all year too. Its buildings and museum keep Memorial Day to Labor Day hours, so in October you'll have the grounds but not the interiors.
For a longer walk or ride, TrailLink describes the Tobacco River Memorial Trail, also called the Kootenai Trail, as a 7.4-mile gravel rail-trail from Riverside Park in Eureka to Lake Court in Rexford. An August 2025 review on the same site says the old rail bed ends abruptly and a road detour connects to the rest of the route toward Rexford, so it isn't one continuous path.
Food stops depend on which day you go:
- Weekday early starts: The Gathering Place Coffee Shop at 101 Julian Drive posts fall/winter hours of 7:30 a.m. to 3 p.m. Monday through Friday and is closed Saturday and Sunday.
- Weekend breakfast: Cafe Jax at 207 Dewey Ave. is listed on a local Eureka restaurant roster as open seven days, 7 a.m. to 2 p.m. An older directory shows different hours, so check before you count on it.
- Trail food: Homestead: The Local Hub at 442 US-93 is listed as healthy grab-and-go, open 10 a.m. to 6 p.m. weekdays and 11 a.m. to 5 p.m. Saturday.
- After the drive: Koocanusa Brewery, five miles south of Eureka, posts Friday through Sunday hours of 3 to 8 p.m.
The Front Porch still lists its summer hours, and the same roster shows The Eagle's Nest at Indian Springs closed for the season. In practice, a Saturday trip to Ten Lakes starts somewhere other than The Gathering Place, and a weekday drive down the byway ends somewhere other than the brewery.
The larch timing in this post is the typical pattern from a Fall 2021 guide, not a 2026 forecast, and the guide's own advice is to watch weather and foliage reports in the weeks before you go.
If larch season has you wondering what your own place near the Ten Lakes roads or the Koocanusa shoreline is worth this fall, Gina Ellis knows the Tobacco Valley well. Request your complimentary home valuation, and it will be ready before the valley turns gold.
