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It’s that time of the year once again. Our green summer dress turns to a variety of colors before entering the quiet season of winter. Sort of like a Latin fiesta.

Already, the stressed and diseased trees have kicked-off speculations about the season’s color quality. Early color, however, is normal. Across much of the Upper Peninsula, the summer has been wetter than usual, certainly with more rain than in 1998. The forest has had a good growing season with plenty of stored reserves.

Red maples in swampy areas are often the first to be noticed because of their scarlet color. Hard to miss as you’re driving down the highway. These harbingers of fall are exceptions, not yet the “real” thing. Black ash normally is the first tree species to go. They often turn a dusky yellow, but sometimes can be brilliant. Oddly enough, it’s also one of the last trees to leaf out in the spring. A “short-season” tree.

Actually, the internal clock that trees use to change colors has little to do with weather. It’s the photoperiod. The relative number of hours of light and dark in a day. Now, some tree species are more, or less, opportunistic. But in general, it’s the photoperiod that affects the timing of leaf drop, not weather, or woolly bears, or bird migrations.

However, the intensity and visual quality of the fall colors can be impacted by weather. Stress might precipitate a more effective or quicker re-absorption of the green chlorophyll pigments. The red, yellow, and purple pigments may stand out better, maybe for a little longer. Frost can also have influence on the quality of fall colors, but not the timing.

The biggest portion of our hardwood, or broad-leaf, forests consist of maples, aspens, and birches. The crimson and gold of maples we all know about and that pretty much beats the pants off color changes in other parts of the country. Our aspens also turn a fantastic yellow color, with the right weather conditions. Birch are much the same way. A bright yellow pure paper birch stand, with snow-white bark, can be quite a visual experience.

But, let us not forget the softwoods, or evergreens. Although they do retain needles year-round, they don’t retain them all. The older needles, nearer to the trunk, fall off every year. The only exception to this is the glorious tamarack. It doesn’t just lose all its needles each fall, but it does it with a blazing aurora of gold!

I think tamarack can provide the very finest fall show of all, under the right conditions. When the sun is low in the west shining on a tamarack grove, and heavy, dark clouds are on the eastern horizon, the scene is enough to stop me in my tracks. Once in northern Minnesota, I nearly hit a moose while viewing such a display. I have since learned to pull over to view a particularly gorgeous view. And often do. I hope that you, too, enjoy the fall this year.

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Bill Cook is an MSU Extension forester providing educational programming for the entire Upper Peninsula. His office is located at the MSU Upper Peninsula Tree Improvement Center near Escanaba. The Center is the headquarters for three MSU Forestry properties in the U.P., with a combined area of about 8,000 acres. He can be reached at cookwi@msu.edu or 906-786-1575.

Prepared by Bill Cook, Forester/Biologist, Michigan State University Extension, 6005 J Road, Escanaba, MI 49829
906-786-1575 (voice), 906-786-9370 (fax), e-mail: cookwi@msu.edu

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By-line should read "Bill Cook, MSU Extension" Please use the article trailer whenever possible.

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Last update of this page was 5 November, 2018