If you’re planning a leaf-peeping trip, you already know that the timing is challenging. Pick the wrong week, and you either arrive before the leaves have reached peak colors, or you arrive too late and miss them.

Now, there’s good news for anybody planning a trip to see fall landscapes.

SmokyMountains.com, the tourism site for the Smoky Mountain region, has released its annual Fall Foliage Prediction Map. The interactive tool gives users a county-by-county and week-by-week prediction of when autumn colors will peak across the U.S.

“Similar to any meteorological forecast, leaf predictions will never be 100 percent accurate,” David Angotti, SmokyMountains.com’s brand founder and map creator, told TravelAwaits. “However, after publishing our predictive fall foliage map for nearly a decade, we are quite confident in our data sources, process, and algorithm.”

How The Map Works

When days start getting shorter, the trees’ leaves stop producing chlorophyll — which appears green from photosynthesis. As leaves lose their green pigment, it allows colors of the other compounds that are present to be seen. Fall leaves get their orange colors from beta-carotene, red colors from anthocyanins (which actually increase in fall), and yellow colors from flavonols.

“The predictive map uses a complex algorithm that carefully analyzes several million data points and outputs approximately 50,000 predictive data pieces,” Angotti told TravelAwaits. “This data then enables our program to forecast county-by-county the precise moment when peak fall will occur.”

In case you’re wondering, those data points come from a variety of private and government sources, including National Oceanic and Atmospheric Administration (NOAA) historical temperatures and historical precipitation records, forecast temperatures and forecast precipitation records, the type of tree that is predominant in geographic regions, and user data.

Here’s how to use the interactive map, which can be found here.

When you visit the map, you’ll see a slider at the bottom of the page. That slider is set to a particular week. As you move the slider from week to week, the map shows the predicted progression of fall colors.

As you would expect, green indicates trees have not begun to change colors and brown indicates the leaves are past their peak. The colors in between show the progression of leaves changing color.

Late-Season Updates

SmokyMountains.com also plans to publish a mid-season update for regions that tend to experience peak fall colors later. This updated map is expected to go live later this month.

There’s also a way you can help update the map.

“For the first time ever, we are encouraging end-users to fill out a simple form to report the fall foliage they are experiencing in their region,” Angotti said. “With tens of millions of annual users, we expect these reports to educate the mode further and impact the mid-year update. In addition, these reports will help us identify both strengths and weaknesses in the current model so we can refine it over time.”

Key States Known For Fall Colors

Here are the best times to see the fall colors in some key U.S. states, according to SmokyMountains.com. 

New Hampshire

If you will be in northern New Hampshire, you can expect to see peak fall colors around September 28. In the southern part of the state, leaves will hit their peak colors by October 12.

Vermont

Fall foliage in Vermont is expected to reach its peak later this month. The ultimate peak is expected between October 3 and 7, although, beautiful colors will still be on display in southern Vermont through late October.

New York

Peak colors in northern New York will start around September 30 and should last until about October 7. Leaves will then be past their peak by mid-October.

Maine

If you’ll be in the northern part of Maine, you can expect to see peak fall colors around September 28. Foliage in the rest of the state will reach peak color a week later. This peak should last until October 10 in the southernmost east and west portions of the state.

Maryland 

In early October, leaf-peepers in Maryland will see tree leaves change to vibrant yellow colors. The ultimate peak, however, will be from around October 7–14. The leaves will then be past peak color by early November.

Rhode Island

Anyone living in or visiting Rhode Island can expect to see fall foliage reach its peak around October 10 and last until October 19. After that, the leaves will be past their peak in late October.

North Carolina

The leaves are expected to begin changing colors in North Carolina around October 7. Trees in most of the state should reach their peak colors around October 19 and last for about a week until October 26.

Tennessee

Trees in Tennessee should reach their peak colors from about October 10 to the 14th. Trees at lower elevations won’t reach their peak colors until early November.

Other States Known For Fall Colors

There are, of course, numerous other states known for their fall colors and autumn celebrations. Here’s a look at the best time to see fall colors in some of those states.

Michigan

Most of Michigan will be near peak color the week of October 3. By October 10, most of the state will see its peak color, lasting for about a week.

Wisconsin

By around October 10, the northern half of Wisconsin should be near peak color. Then, around October 17, the northern part of the state will have reached peak color, while southern Wisconsin will be near peak.

Illinois

Northern Illinois should see peak color around October 24, while central Illinois will still be near it. A week later, by Halloween, northern Illinois will be past peak, central Illinois will be at peak color, and southern Illinois will be near peak.

Missouri

Much of Missouri will be near peak color around Halloween. Then, around November 7, trees in most of Missouri will have reached peak color.

Colorado

In Colorado, people around the Denver area can expect to see trees at near-peak color around October 3. Then, they will have reached peak color by around October 10, before reaching past their peaks by October 17.

Know Before You Go

Many people will use the Fall Foliage Map to plan local trips near their homes. On the other hand, if you want to travel to another state, or simply find the best places to see fall colors close to home, SmokyMountains.com can help.

SmokyMountains.com has also compiled a list of the best places to watch leaves change color in each state. The aptly titled “Top Places to See Fall Foliage in All 50 States” can be found here.

For more about fall colors, be sure to read our fall travel content, including: