US lakes & pondsUS lakes & pondsSurface area: The USGS National Hydrography Dataset outline (NHD Permanent ID 139732639).
The red circle marks Lake Ronkonkoma.
Towns and counties: U.S. Census Bureau boundaries overlaid on the USGS lake outline.
Official NYSDEC pages. Rules and fees change; check before you go.
Built only from the data on this page: official access lists, OpenStreetMap beaches and trails, campground listings, state and USGS invasive-species records. We don't rate crowds or water quality.
Fish species listed by NYSDEC for this recommended fishing water: Smallmouth bass, Largemouth bass, Sunfish, Yellow perch, Crappie, Chain pickerel, Walleye, Carp.
Stocked by the state: Walleye (2011–2025, 15 years; 78,596 fish in all, fry included)
Source: New York State Department of Environmental Conservation: Recommended Fishing Lakes and Ponds and Fish Stocking Lists (2011 on) on data.ny.gov, records for Lake Ronkonkoma (Suffolk County). NYSDEC page.
Numbers on the map match the list at rightbelow.
Shoreline: USGS National Hydrography Dataset (NHD Waterbody, Permanent ID 139732639), public domain. State outline: U.S. Census Bureau TIGERweb. Points: NYSDEC boat launch sites (data.ny.gov). Dashed trails: © OpenStreetMap contributors (ODbL). Interactive map: Leaflet with © OpenStreetMap contributors. Not for navigation.
OpenStreetMap shows about 0.8 mi of public hiking and walking trail within about 100 m (330 ft) of the Lake Ronkonkoma shoreline, mostly along the west shore.
No trailhead is mapped for these trails. The closest public access site is Lake Ronkonkoma DEC boat launch, 50 ft from a shoreline trail (NYSDEC boat launch data).
The dashed brown line on the lake map shows these trails. We include paths, footways and marked trails that OpenStreetMap doesn't mark as private, and leave out roads, sidewalks and snowmobile corridors. Mapped trails can still cross private land or close for the season, and not every trail is mapped, so follow posted signs.
Trails: © OpenStreetMap contributors, available under the Open Database License (ODbL). Map data as of Oct 9, 2026. Trail lengths count only the parts within about 100 m of the USGS NHD lake outline.
We found 7 campgrounds and RV parks within 15 miles of Lake Ronkonkoma. Distances are straight-line from the nearest point on the shoreline, so driving distance is longer.
Toilets
Electric hookups
Electric hookups
All campgrounds & RV parks in New York
Green tent icons on the lake map mark campgrounds near the shore, and the interactive map shows the closest 12. Amenities are listed only where a source records them; call or check the campground's website before you go, since seasons and rates change every year.
Campground data: Recreation.gov (RIDB) · OpenStreetMap contributors (ODbL). Pulled Oct 12, 2026.
Live from the National Weather Service API for the lake's coordinates (40.8271, -73.1228). The nearest station may be several miles away. NWS forecast for Lake Ronkonkoma. No live water-temperature sensor is shown because we haven't found a public one for this lake.
Based on solunar theory, an estimate. Major periods (about 2 hours) center on when the moon is directly overhead or underfoot; minor periods (about 1 hour) center on moonrise and moonset. The 0–100 activity score rises during those periods and gets a boost near sunrise and sunset and around the new and full moon. Weather, water temperature and pressure often matter more. Sun and moon times are calculated in your browser from the lake's coordinates with standard astronomy formulas, shown in ET (America/New_York), and accurate to within a few minutes.
1 public access site listed, 1 with a boat ramp or trailer launch.
| Site | Town | Owner | Type | Parking | Fee | Uses | Map |
|---|---|---|---|---|---|---|---|
| Lake Ronkonkoma DEC boat launch | Islip | NYSDEC | Trailer - Improved · Yes ramp | 25 trailer | — | Boating | 40.8294, -73.1289 |
NYSDEC boat launch sites (data.ny.gov)
Fees, hours and rules change; confirm with the site owner before you go.
Reported on or near Lake Ronkonkoma
USGS Nonindigenous Aquatic Species database
USGS records matched to this water by location (within about 150 m of the outline) or by the place name in the record. A record shows a sighting was reported; it doesn't prove the species is still there. As of Oct 10, 2026.
Lake Ronkonkoma covers about 229 acres in Islip, New York (Suffolk County).
NYSDEC fishing and stocking data lists Walleye, Largemouth bass, Smallmouth bass, Crappie, Yellow perch, Sunfish, Chain pickerel and Carp.
Yes. 1 public trailer launch is listed: Lake Ronkonkoma DEC boat launch. Check posted fees and parking rules.
Yes. We list 7 campgrounds and RV parks within 15 miles.
Lake Ronkonkoma touches Islip in Suffolk County, New York.
Know Lake Ronkonkoma? Tell us about the launch, parking, where they're biting or anything a first-time visitor should know. Tips go privately to the LakeRipple editor; nothing is posted automatically. Helpful tips may be featured on this page (we'll use your first name only if you give one).
Straight-line distance between lake centers. All New York lakes & ponds · All waters in Islip