We set out to follow the trip description from Goldman's "75 scrambles" which described an uncomplicated class 2 ramble up Sperry, followed by a traverse over to Vesper. The description may be okay, but it is supplemented by a route drawn on a map which is completely wrong and misleading. For information on climbing Sperry, I'd say look at Beckey, and also this description http://www.nwhikers.net/forums/viewtopic.php?t=7987423 . I'd also say doing Sperry and Vesper in one day would have likely taken us more than the allotted 10 hours.
Anyway, we started at 8:30 on a dark forest trail. Huge trees, waterfalls, mushrooms, an easy crossing of the Stillaguamish on a make-shift bridge, then we broke out into the open. The fall color is going nicely. The hike up to Headlee pass was on good trail, although we managed to lose it once by following misleading cairns, and a second time following a stream gully. There were a few inches of snow on the trail in the morning near Headlee pass, which had melted by the afternoon. We traversed the big rockslide, which was slippery with snow in the morning, mostly dry by the return. We then looked for a way up the intimidating looking Sperry. The rockslide at its skirt was covered by between 6 inches and several feet of snow, making for tricky slippery hiking with postholing. The book said to head for the west shoulder, using trees as handholds. The west shoulder seemed to be guarded by a skirt of snowy cliffs, so instead we attacked the only route we could see going anywhere and headed up a gully ending at a deep notch. The gully turned into a 45 degree slope of with 6 inches of crusty snow covering heather. We got out our ice axes and kicked steps up it to the notch, where we found that to continue up the ridge would require a 4th class scramble on steep exposed rock--too scary for us. Instead we had to downclimb our steps, toes in, very carefully. We then sat around on a dry rock in the warm sun for a while, gazing at Sperry and Vesper, contemplating our options and eating lunch. A guy climbed up to us who had been following our steps, and we broke the bad news to him that they led to a dead end unless you are willing to do somewhat exposed and tricky climbing. He went off to seek another route.
Our experience on the snow covered boulder field led us to overestimate the difficulty of Vesper, but we finally worked up enough energy to try it--and easily followed someone's snowshoe tracks to the summit. We encountered only a minor amount of postholing. No ice axe needed for Vesper, but poles were very useful. Snowshoes would make some parts easier and some harder. An ice axe would be needed for Headlee pass if snowy.
The summit of Vesper was exhilarating and totally made up for the frustrations of the earlier part of the day. The view is completely overwhelming with seemingly most of the major peaks of the state in view. We gasped and recoiled from the view down the north face to the glacier.
trip totals: 9.5 hours, 10.5 miles, 4500' feet.