Summit Post details this trail nicely and includes photographs.
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Adapted from Summitpost.org:
Little Annapurna is easily accessible by trail. One trail comes up from the Snow Creek Trailhead, a good ten miles or so distant from Little Annpurna’s summit and 7100 feet lower so doing it in one day is a real event. The other trail comes up from the Stuart Lk / Colchuck Lk trailhead and is about 7 miles in distance with and elevation gain of 5100 feet. This route takes you up and over Aasgard Pass which should be done in the early part of the day during the hot time of the year.
Nearest Town: Leavenworth/Plain
Turn onto Icicle road, going 4 miles until you come to the Snow Creek Trailhead parking area, very obvious on the left. Should you decide to go in via the Snow Creek trail, the most common route into the Enchantments, go no further. If you are going to use the Aasgard route via Colchuck Lake and the Stuart Lake TH, continue on past this parking area until you come to a turn off for Bridge Creek camp ground (left turn only) and FS road #7601, crossing a bridge over the Icicle River and continue onward almost 4 miles until the road ends at the Stuart Lake / Colchuck trail head parking area. Northwest Forest Service pass required.
Leave It Better than You Found It. This should be every user’s goal. Pick up trash left by others, pull noxious weeds along your route, throw branches over unwanted spur trails, etc.
Disclaimer. Treat this information as recommendations, not gospel. Conditions change and those contributing these reports are volunteers–they may make mistakes or not know all the issues affecting a route. You are responsible for yourself, your actions, and your safety. If you won’t accept that responsibility, you are prohibited from using our information.