updated 2:49 p.m. ET Aug. 15, 2008

NEW YORK - New England's fall foliage typically peaks in late September and early October. But around the country, leaf-peeping season runs longer than you might think.

Autumn comes early in Alaska, brushing Denali National Park with purple and gold in late August. In warmer climates and near sea level, fall colors can last well into November. Last year, trees in New York City's Central Park were still putting on a show the week before Thanksgiving.

And while New England is the undisputed queen of classic autumn scenery, other regions brag about foliage too, from Yosemite National Park in California to North Carolina's mountains to Michigan's Upper Peninsula. The U.S. Forest Service links to fall color reports in all but a few states here.

Verna Pratt, who has co-authored five books about Alaska's native plants, grew up in Massachusetts and admits that "nothing matches the maples" back east in the fall. "But there are things that bring good colors here in Alaska," added Pratt, who lives in Anchorage. "I love going up in the mountains in September here to see the yellows of the willows and the orange of the blueberries and the red of the bearberries and the purpley fireweed."

In most regions, color appears first in northerly areas and higher elevations, then gradually spreads to valleys, coastal areas and southerly regions. But precisely when the leaves turn, and how brilliant the colors will be, can't be predicted too far in advance, because it depends on early fall weather.

"One of the things that is really critical is cool nights," said Howard Neufeld, a professor of plant physiology at Appalachian State University in Boone, N.C. "Starting in September, if it starts to get cool but not below freezing, if you have clear cool days and cool nights, it stimulates fall color."

Cold and rainy weather, with less sunlight, results in fewer reds. That's because sunlight stimulates red pigment, Neufeld said. And if it's too warm, chlorophyll stays active longer, keeping leaves green. Trees need cool temperatures to degrade chlorophyll and "reveal the red and orange colors," Neufeld said.

Some people like the unpredictability. "It's all a pattern but it's never the same, which is what's really cool about it," said Suzi Brakken, a self-described "fall color nut" and director of California's Plumas County Visitors Bureau. "It's a new show every year."

Here are some details on where and when to see fall foliage in five parts of the country — Alaska, New England, Michigan, North Carolina and California.

Alaska: In Fairbanks and Denali National Park, "fall will begin mid-August and it will be peaking there the end of August and first week of September," said Kyle Kelley, general manager of Alaska Wildland Adventures whose late summer tours include fall foliage viewing in Denali and other areas. Fall lasts just a few weeks, "and then all of a sudden those bright colors are gone, and you're into winter pretty quickly," he said.

But on the Kenai Peninsula and in Anchorage, "we have a more temperate climate. The fall colors kick in about the third week of September and into the first week of October," Kelley said.

John Hall Jr. says late summer tours from his company, John Hall's Alaska "are always the first to sell out. The high demand for the last part of August is because of the fall colors." His itineraries include three national parks where fall color in the tundra at high elevation starts in August: Denali, Wrangell-St. Elias and Gates of the Arctic. He said Aug. 25-Oct. 5 is his "favorite time of year because you're getting those colors."

Look for cottonwoods, aspens and birch (yellow); bearberries and blueberries (red and orange); and fireweed (purple).

New England: Foliage in New England usually peaks the last week of September through mid-October, according to Jeff Folger, a photographer and blogger who chases fall color for Yankee magazine and tracks foliage at http://www.yankeefoliage.com.

Folger advises travelers to pick a central location as a base of operations, such as Conway, N.H., Woodstock or Bennington, Vt., the Berkshires in Massachusetts, or Sebago Lake in Maine. Then explore the area rather than trying to cover too much ground in a couple days. If you can only do one trip, Folger says Oct. 4-10 is often a prime color week, with southern New Hampshire a good place to start. Best trees for color include maples, red oaks and birches.

Folger plans to take the ferry from Vermont to New York across Lake Champlain on Columbus Day, its final day of operations for the season. Then he'll spend the last half of October in southern and coastal New England: Cape Cod, Connecticut, Rhode Island.

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"Near the coast is the last place you'll find color," he said, "where it's lower and warmer." While he's there, he likes to check out the cranberry harvests or and King Richard's Faire in Carver, Mass., a fall Renaissance festival.

Michigan: Fall color can be found in many parts of the state, such as the Upper Peninsula's hardwood forests and the northwest region including Petoskey, Charlevoix and Traverse City.

"From mid-September to late October, we see a variation of fall color rolling through from the western Upper Peninsula to the southeastern portion of the state," said Kirsten Borgstrom of Travel Michigan. "The lakes tend to pop toward the last moment, mid- to late October."

Recommended destinations include Michigan wineries, parks like Pictured Rock National Park in Munising, and scenic roads like M119, nicknamed the "Tunnel of Trees" for a dense leafy canopy "that makes it look like evening in the middle of the day," Borgstrom said. M119 runs north of Petoskey to Cross Village near the Lake Michigan shore.

Foliage reports start after Labor Day on Travel Michigan's Web site.

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