That thermal mass is the whole story. The lake holds summer heat deep into autumn, keeps the surrounding slopes from freezing when the plateau above is already locked in, and creates a microclimate that makes viticulture possible at this latitude. The Seneca Nation farmed these shores and built their capital, Kanadeseaga, near what is now Geneva, before Washington's troops burned their villages in 1779. Catherine's Town, near present-day Watkins Glen, was among those destroyed. The early nursery industry that made Geneva's founding wealth began with the Kanadesaga fruit trees that survived Washington's campaign.

Hobart and William Smith Colleges trace their origins to Geneva Academy, established 1797 at the lake's north end, on land that was Seneca Nation territory. The institution's specific claim: Elizabeth Blackwell applied to and was rejected by 29 medical schools before being admitted to Geneva Medical College in 1847. She graduated two years later at the head of her class, the first woman to receive a medical degree in the United States. This happened six miles west of Seneca Falls, in the same decade as the women's rights convention.

By 1900 there were more than 20,000 acres of vines across the Finger Lakes, with Seneca at the center. Prohibition dismantled most of it. Scientists at Cornell's Agricultural Experiment Station in Geneva spent subsequent decades convinced that European wine grapes could not survive these winters. In 1951, a Ukrainian viticulturalist named Konstantin Frank looked at the cold Seneca slopes and recognized the conditions from home. He was right. Hermann Wiemer, who came from Germany's Mosel Valley, saw the east-shore slopes in the 1970s and recognized the geology. He stayed for the rest of his working life. The Rieslings from those slopes have been earning the comparison ever since.

Geneva anchors the north with a real downtown, Hobart and William Smith Colleges on the lakefront, and the Cornell Experiment Station where the wine region's modern history was made. Watkins Glen anchors the south with the best gorge trail in the Finger Lakes and a village that has been drawing visitors since the 1840s. Between them: 28 wineries on the Seneca Lake Wine Trail, two shore roads, and the steepest east-facing shale slopes in the region.

4 hours from New York City via I-86 to Route 14. Syracuse Hancock Airport is 1 hour northeast; Rochester Airport is 1 hour northwest. A car is required.

Route 14 runs the west shore from Watkins Glen north through Rock Stream, Dundee, Himrod, to Geneva. More producers, more traffic. Route 414 runs the east shore north through Burdett, Hector, and Lodi. Quieter, steeper, the better second day. The two roads connect at Geneva on the north end and Watkins Glen on the south.

Two days minimum to run both shores properly. Three days if you want the gorge at Watkins Glen, the heritage sites near Seneca Falls, and time at the east-shore wineries without rushing.

Geneva anchors the north end with the most lodging options and a walkable downtown. Watkins Glen anchors the south and puts you closest to the gorge. Glenora Wine Cellars on the west shore is the only mid-lake overnight.

Spring is the underrated window. The gorge trail opens in mid-May, snowmelt runs the falls hard through April, and the tasting rooms are quiet enough that winemakers have time to talk.