To qualify for the patch for this list, all summits must be ascended and descended on foot from/to a roadside trail head (riding the Cog or driving the Auto Road up Mount Washington, or riding the Gondola/chairlift up/down one of the several ski area peaks does NOT count). The ascents for this patch can be done at any time of the year, though there is a separate list for only winter ascents. In the spring of 2012, the AMC welcomed the 10,000th reported completer of this "anytime" list (repeat completions are not tracked aside from the winter list completions).
From 2001-2007, my father and I tackled this list, traveling nearly 9 hours out from our Rochester, NY home to the White Mountains for a week each summer (except 2005 and 2006) to peak-bag. On September 30, 2007, we stood upon Mount Carrigain on a beautiful early fall day and celebrated our completion.
I am nearly complete with a 3rd full round of this list, and I've done several of these peaks in each of the 4 seasons too.
The rules for completing this list can be found at the AMC's 4000-footer page.
Note: a (W) after a date denotes an "official" winter ascent per the winter 4000-footer rules.