By John L. Turner

As summer melds into autumn, the changes in temperature and daylight length are hardly, if at all, noticeable to us. But not so with the trees of Long Island’s forests. They are attuned to incremental changes in environmental conditions and have begun to prepare for the impending winter although it is still several months away.

The first and most conspicuous sign of this preparation is the color change in the countless leaves adorning the almost countless trees. During the summer leaves are filled with chlorophyll pigment necessary for plants to photosynthesize. As summer wears on, trees begin to break down chlorophyll pigments, reabsorbing the vital nitrogen and as a result other pigments are revealed. The color of the leaf depends on which pigments appear — anthocyanin produces red colored leaves, xanthophyll creates yellow, and carotene results in orange and gold. A fall season with cool nights and warm sunny days produces the most intense colors. 

There are a dozen or so tree species along the North Shore providing the riot of color a that a spectacular autumn burst can bring. Two wetland trees are especially colorful, indeed brilliant — red maple and black tupelo. Their leaves turn an intense orange-red, so colorful it appears if they are illuminated from an internal light source.  Tupelo starts turning early — beginning in mid-August. 

Add to this the butter yellow of the hickories, the lemon-yellow of sassafras, the bright red of scarlet oak (easy to understand how it got its name when you see it in autumn splendor), the similarly colored red oak, the solid tan of beech, the duller orange of black oak, and the solid gold of black birch, and it’s clear that Long Island’s forests can paint an eye-pleasing show!       

Fortunately, there are many parks and preserves along the county’s North Shore where you can see leaf change. Caleb Smith State Park Preserve in Smithtown can be a go-to locale given the amount of red maple and tupelo growing in and along the park’s numerous wetlands. The same goes for the adjacent Blydenburgh County Park. Cordwood Landing County Park in Miller Place, a gem situated on the shore of Long Island Sound, produces a nice palette of color that includes two rarer orange-leaved trees — Hornbeam and Hop Hornbeam.  

A walk along the Long Island Greenbelt Trail in Arthur Kunz County Park on the west side of the Nissequogue River, accessed from Landing Avenue in Smithtown, can be good for leaf peeping with an added bonus of beautiful views of the river and its marshland, the grasses of which turn an attractive russet color in the fall. 

Makamah County Nature Preserve in Fort Salonga is similar — colorful woodland scenes with peeks out to the adjacent marshland. A less well-known county park, fine for leaf peeping, is Rassapeague County Park located in the Village of Nissequogue along Long Beach Road. 

A little further afield, the 100,000 acre Pine Barrens Preserve of central and eastern Suffolk County offers many places to view the leaf change and is especially beautiful in certain areas as the bright red and orange of the red maples and black tupelos blend with the tans, browns and burgundy of various oaks. Adding to the palette here are the medium green colors of Pitch Pine and in some places the darker greens of Atlantic White Cedar. 

Good places in the Pine Barrens to see the leaf change are the Quogue Wildlife Refuge, Cranberry Bog County Nature Preserve accessed by County Route 63 in Riverhead, and The Nature Conservancy’s Calverton Pond Preserve in Manorville.

A resident of Setauket, author John L. Turner is conservation chair of the Four Harbors Audubon Society, author of “Exploring the Other Island: A Seasonal Nature Guide to Long Island” and president of Alula Birding & Natural History Tours.

This article originally appeared in TBR News Media’s Harvest Times supplement on Sept. 12.