Northern Limestone/Dolomite Valleys

The nearest weather station at Harrisburg Capital City Airport, 13 km away, recorded a mean daily high of 75.8°F over the past 30 days, 0.7°F above the 1991-2020 normal of 75.1°F, and a mean daily low of 58.5°F, 3.3°F above normal of 55.2°F. Above-normal temperatures in early October suggest a warmer-than-typical autumn so far at the ecosystem.

Monarch butterflies recorded October 1-2 at Raspberry Lane in Harrisburg, Vincent DeFilippo Nature Preserve in Cumberland, Kent Drive in Mechanicsburg, and Sterling Road in Harrisburg. The species is proposed threatened and currently migrating south; peak passage through Pennsylvania runs mid-September through early October as the super generation heads toward Mexican overwintering sites.

Spotted Lanternfly documented October 3 on Columbia Street in Middletown, Pennsylvania. This introduced species continues its established presence in the region; 14 sightings over the past month show active dispersal through late summer and early fall.

Gray Treefrog recorded October 4-5 in Mechanicsburg and York County. In Pennsylvania, the species is abundant and widespread statewide; early October sightings are consistent with post-breeding activity as temperatures cool and frogs prepare for winter dormancy.

Wingstem continues in bloom through early October, with the most recent observation on October 4, displaying its characteristic yellow daisy-like flowers. The tall native wildflower is in its expected late summer into fall bloom period, which typically runs July through October. Observations across the region show this species actively flowering.

A Wood Thrush was recorded at Mountain Road in Boiling Springs on October 1, during peak southbound migration. This species, listed as a Bird of Conservation Concern rangewide, has declined more than 50 percent since 1970 across its North American range.

Four Peregrine Falcons were observed at Waggoner's Gap on October 5, a traditional raptor migration site in Pennsylvania. Arctic breeding subspecies pass through the state in fall migration en route to Latin American wintering grounds.

A Ross's Goose was reported at Children's Lake on October 5, with nine separate observations confirming the sighting. This Arctic species is migrating through during its fall range, having departed Canadian breeding grounds by mid-October as part of its southward passage.

Eastern box turtles (Terrapene carolina) are still on the move in the limestone valleys. Eight were logged in Berks and Lancaster counties between August 8 and August 26. Late summer is the easiest time of year to meet one: a high-domed shell about the size of two cupped hands, dark brown or black with a scatter of yellow and orange marks, working slowly along a field edge, a woods road, or, too often, the shoulder of a paved one. What sets a box turtle apart from every other turtle here is the hinge across the lower shell. When threatened it pulls in head and legs and shuts the plastron up against the upper shell front and back, sealing itself completely. A snapping turtle or a painted turtle can't do that. If it opens up again, get a look at the eyes: males usually have red or orange eyes, females brown. This time of year they are eating what the season drops. Box turtles forage by day and take almost anything, earthworms, slugs and insects early in the summer, then shifting toward fungi and fallen fruit as those come on in late summer and fall. A turtle picking through a patch of mushrooms or under a wild grape or mayapple is doing ordinary early-September work. Seeds pass through it intact, so a turtle that eats fruit in one spot and wanders off carries the next generation of that plant somewhere new. The wandering, though, happens on a small scale. A box turtle spends its life (sixty years is not unusual, and some go well past that) in a home range of a few acres, and it knows that ground. Move one across the county and it will try to walk home. Move it across a road and it will usually try to cross back. That is why the right thing to do with a turtle in the road is to carry it to the side it was already heading toward, and no farther. Later in the fall, as the nights cool, each one digs into loose soil under the leaf litter, often in the same place it used the year before, and waits out the winter in a torpor a few inches underground. A slow animal that lives in a few acres for six decades and has to cross the same roads every year is exactly the kind that can disappear from a patch of woods while still looking common everywhere else. iNaturalist flags the species as threatened; it carries no federal listing. In these valleys, where woodlots sit between fields and subdivisions and every one of them is edged by pavement, the road shoulder is where most people will meet one.

The Locust Point Quarry, an active limestone and dolomite operation, is currently listed by EPA in significant non-compliance with its Clean Water Act discharge permit. The status itself doesn't specify which parameter is being exceeded or by how much; those effluent details aren't part of the current record. What's confirmed is the fact of the violation and, critically, where it's happening. Location matters more here than it would almost anywhere else. This is the Northern Limestone/Dolomite Valleys, part of the broader Ridge and Valley province within the Appalachian-Blue Ridge forests, carbonate rock riddled with fractures, sinkholes, and underground drainage, the very terrain the ecoregion is named for. Water here rarely gets the slow filtration through soil that most landscapes provide. It moves fast through solution channels, often passing straight from a surface discharge into groundwater and the springs that feed local streams, with little of the natural buffering found elsewhere. A quarry actively cutting into that same rock, while out of compliance with its discharge limits, sits directly on the terrain's most vulnerable feature. For scale, Locust Point Quarry is one of five facilities in significant non-compliance among 482 active discharge permit holders within ten miles, a group that also includes the Harrisburg AWTF, Silver Spring Country Estates, and Rohrer Bus Service, and one of 55 currently in some violation. Separately, 27 of 28 assessed water bodies in the region are still meeting water quality standards, a reminder that a permit violation and a measured downstream impairment are two different things. A facility can run out of compliance for a stretch before that shows up as damage anyone can measure in the water itself, especially in ground that drains this fast and this far out of sight.