In-between Crack offers climbers a concise but rewarding taste of classic trad climbing within the rugged contours of the Flatirons, just north of Boulder, Colorado. This 30-foot route presents a demanding yet accessible test of crack skills, where narrow hand jams and precise body positioning take center stage. The climb begins with a series of confident lieback moves along a slender dihedral, where the rock's texture seems to invite your fingertips to find purchase amidst the subtle imperfections. As you ascend, the crack tightens into a thin hand crack that challenges your ability to maintain balance while threading pro precisely. The summit offers a rewarding topout that requires careful footwork and steady nerves, rounding out the climb with a satisfying finish.

The Flatirons themselves stand tall above the city, their sharp ridges etched against the Colorado sky, where morning light casts long shadows and the wind plays through the pines. Approaching In-between Crack, the trail weaves through open meadows and patches of fir, with the scent of dry pine needles and warm granite underfoot. The route's modest height allows for a day climb, ideal for those looking to sharpen their crack climbing techniques without committing to a multi-pitch climb.

Protection is straightforward but demands attentiveness: gear placements range up to 2 inches, requiring a solid rack with micro cams and some mid-sized pieces to secure your ascent. While the route feels moderate, the tight crack and thin dihedral reward patience and precision over brute force. After topping out, a simple walk-off to the left lets you descend smoothly back to the trail, making this a convenient loop for an afternoon session.

For climbers in the Boulder area, this route strikes a balance between engaging technical climbing and accessible approach. Timing your climb for early morning or late afternoon can shield you from the full heat of the day, while the prevailing southwestern aspect ensures the rock warms quickly during chillier months. Though the route is short, its focused challenge and scenic surroundings enrich every move, encouraging climbers to refine their technique while absorbing the crisp mountain air and vast views.

Preparing for this climb means bringing sturdy shoes that can handle tight crack climbing, plenty of water for hydration, and layering options as mountain weather can shift rapidly. The route’s simplicity belies the thoughtfulness required on the rock, making it a perfect spot for climbers stepping up to 5.9 crack challenges or for seasoned adventurers seeking a brisk, confident climb close to town.