The phrase "a trailhead of" is correct and usable in written English.
It can be used to describe the starting point or origin of a path, journey, or process, often in a metaphorical sense.
Example: "The new policy serves as a trailhead of our efforts to improve workplace diversity and inclusion."
Alternatives: "a starting point of" or "an origin of".
Jack and his guides then drove us 20 miles to a trailhead at the edge of the Bob, where we mounted our horses for the ride to the seasonal Rich camp, our base for our five-day outing.
With all of the adrenaline and excitement of hitting a trailhead, it's common for people to push too hard at the beginning and burn out during the climb.
The stock recently bounced off of long-term support from its 80-month moving average and could be at the trailhead of a renewed uptrend.
From Central's bus terminal my friend and I took a 30-minute ride to Stanley on the south side of the island, got off at a gas station where we met four more friends, then carefully crossed a busy street to the well-marked trailhead of the 48-mile Wilson Trail in the backyard of a pink apartment building.
By far the most popular hike in Aspen, the trail along Maroon Lake draws even the most flatfooted visitors: out-of-shape parents, their khaki pants and polo shirts drenched in sweat within a few hundred feet of the trailhead, out-of-breath grandparents stooping at the side of the trail, teenage girls intent on hiking in their flip-flops.
He parked at the trailhead of the Alakai Swamp Trail on a ridge above a verdant river valley.
Whitney Portal (the southern trailhead of the JMT) has a store and restaurant where you can enjoy that food item you've been dreaming about for the last week.
Similarly, an unmarked road walk connects Clonegal with the trailhead of the South Leinster Way in Kildavin, County Carlow.
The Kolb Brothers, Emery and Ellsworth, built a photographic studio on the South Rim at the trailhead of Bright Angel Trail in 1904.
But the trailhead of the path she wanted to take was blocked by a phalanx of tourists from the boat, and Goodall knew they would detain her if she tried to go that way.
