The Flatirons rise dramatically above Boulder, their golden sandstone faces marking the start of the Rocky Mountains. Just minutes from downtown, these iconic formations blend wilderness and accessibility, offering hundreds of climbing routes that range from mellow scrambles to long, exposed multi-pitch adventures.
The rock here — solid sandstone with crisp edges, pockets, and slabs — makes for some of the best moderate climbing in Colorado. While grades often feel approachable, many routes demand focus, creative route-finding, and comfort with exposure. Each climb offers sweeping views of Boulder to the east and the Continental Divide stretching across the western horizon.
The First Flatiron’s Direct East Face (5.6) and Third Flatiron’s Standard East Face (5.4) are timeless classics, celebrated for their fun movement and incredible position high above the city. For more challenge, The Maiden’s East Ridge (5.10c) combines varied climbing with one of the most breathtaking rappels anywhere on the Front Range.
Whether you’re chasing your first summit or revisiting an old favorite, the Flatirons deliver a unique adventure, a place where world-class climbing, history, and scenery meet right at the edge of town.
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Note: Several formations, including the Third Flatiron, are subject to seasonal wildlife closures (typically February through July).
Your Clothing
Bottom
Cotton or synthetic climbing pants/capri’s
Shorts for hot weather
Top
Fleece or lightweight down sweater
Lightweight wind shell
Water proof rain jacket – lightweight gore-tex or similar
Short-sleeved shirt
(Optional) Sun hoody
Head
Baseball hat – for sun protection
Hands
1 pair of lightweight leather belay gloves – hardware store versions are great
Feet
Sticky rubber approach shoes or light hiking/trail running shoes (closed toe mandatory)
Cotton or Synthetic socks
Technical Equipment: Provided or bring your ownÂ
Harness – UIAA/CE rated climbing harness with belay loop and gear loops. Should be able to fit on the outside of your layers.
Helmet – UIAA/CE rated climbing helmet.
Belay/rappel device – plaquette, tube style device preferred
2 locking carabiners – large, round stock screw gate carabiners that are easily manipulated while wearing gloves
Sticky rubber rock climbing shoes
*All technical equipment will be provided by SAI, but if you have our own, it’s encouraged that you bring it.
Food
2L of water
800 -1200 calories of food – energy bars, sandwiches, fruits, etc
Personal
Backpack – 25-30L
2 Large mouth water bottles, 1L capacity each.
Lip balm
Sunscreen
Smartphone
Summit Ascents International is an authorized mountain guide service of Rocky Mountain National Park, Jefferson County, Colorado and Boulder County, Colorado. Â
 
