Green Mountain Foothills

Northern caddisflies were recorded on October 1, 2026 near Underhill. This subfamily is very sensitive to organic pollution and their presence indicates clean, well-functioning aquatic habitat. The observation in early October marks successful emergence from a stream larval stage.

A four-toed salamander was observed at Centennial Woods in South Burlington on 2026-09-16. This threatened Vermont species of special concern is patchily distributed and most common in the Lake Champlain Basin; the Centennial Woods location represents occupied habitat within its known range.

A northern leopard frog was recorded at Roosevelt Highway in Colchester on 2026-09-24, Vermont's state amphibian. Though federally unprotected, the species faces habitat loss and environmental change; sightings in actively used wetlands like this document its persistence in the area.

Pink turtlehead, a southern Appalachian ornamental flagged as introduced, was observed on 2026-09-18 in Jeffersonville. Hardy to USDA zone 3 and commercially cultivated, the late-September timing aligns with its typical bloom phenology in northern gardens.

Dwarf mallow, an invasive annual, was observed on 2026-09-22 at Shaw Rd, Cambridge, VT. The species is documented as invasive in the United States and continues through late September, with seed production imminent as the plant approaches dormancy.

On 2026-09-29, sugar maple, northern red oak, white ash, black ash, American elm, black walnut, and black cherry all showed colored leaves and falling leaves in the Green Mountain region. This late-September autumn progression occurred while mean daily temperatures averaged 1°F above normal, potentially moderating the pace of senescence as the season advances toward dormancy.

Four Northern Pintails arrived at Lake Lamoille on September 24, aligning with the species' early fall migration pattern. Pintails are among the first ducks to depart breeding grounds in August and early September, reaching wintering areas in October and November. The sighting marks typical early-season movement for this waterfowl species.

Only 0.70% of Lamoille County is in Moderate Drought (D1) or worse as of September 15-21, with the remainder classified as Abnormally Dry. The minimal drought footprint reflects the region's early-autumn moisture status; this represents no intensification from the prior two weeks, indicating conditions are stable despite the month's precipitation shortfall.

Month-to-date precipitation at Mount Mansfield station is 0.9 in, running 3.5 in below normal for this date. The Lamoille River at Johnson measured 134 cubic feet per second on September 22, near the week's low range but within recent variability. Below-normal rainfall in early fall typically translates to reduced base flow as groundwater recharge lags; this deficit suggests streamflow may continue to run lower than seasonal norms into early October without significant precipitation.

Mayflies were recorded in Jeffersonville on August 31. These pollution-sensitive aquatic insects require well-oxygenated water and are recognized indicators of good water quality, their presence marking functional habitat in the stream.