From AK-1 or the (Seward Highway) take the O'Malley Road Road exit, go west about 3.5 miles (towards the mountains), the road climbs up in elevation and you'll be turning, right (south) on Hillside Drive. Go one mile and then you will make a left turn (towards the mountains) on Upper Huffman Drive. The road will appear to come to an end where you turn right on to Toilsome Hill Drive the road quickly makes a hairpin turn before somewhat leveling out on to and seamlessly becomes Glen Alps Road. Almost 2 miles after turning on to Toilsome Hill Dr turn left, into the Flattop Mountain Trail parking lot.
There is a parking fee, and the ticket machine accepts credit cards.