Lake near Union County College Cranford NJ – Union Lake, New Jersey
Tumbling Dam at Union Lake – Union Lake, New Jersey
Union Lake, Millville, N. J., no. 1 LCCN2013646510 – Union Lake, New Jersey
4.1★★★★☆

Union Lake

New Jersey · Northeast · USA

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Water Temp70°F
ClarityClear
DifficultyEasy
EntryFree
Best TimeJune through September
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Can you swim at Union Lake? Yes. Public swimming – lifeguards on duty in season · sandy beach · free entry · best June through September.

Swimming Guide

What to expect at Union Lake

YesPublic swimming
70°FSummer water
June through SeptemberBest months
ClearWater clarity
LakeWater type
CalmCalmness
1 sandy beachSandy beaches
Yes - seasonalLifeguards
NoPiers & docks
Free parking for approximately 100 vehiclesParking
FreeCost
SuburbanLocation

About Union Lake

Union Lake stands as one of New Jersey's hidden aquatic gems, offering swimmers a serene escape from urban congestion. Nestled in a scenic setting with mature trees framing its shores, this lake captures the essence of natural beauty with a peaceful atmosphere that appeals to both serious swimmers and casual visitors. The water maintains excellent clarity throughout the swimming season, revealing the lake's clean bottom and inviting swimmers of all abilities. The surrounding landscape features lush vegetation and quiet coves that make for a meditative swimming experience. What makes Union Lake truly special is its commitment to maintaining a family-friendly environment while preserving natural habitat. The lake's moderate size provides excellent opportunities for exploration and varied swimming routes. Practical tips: Arrive early on weekends to secure optimal parking and avoid afternoon crowds. Bring water shoes to navigate the shallow entry areas comfortably.

About This Lake

Swimming Conditions

Union Lake maintains clear water conditions ideal for safe swimming throughout the season. Water temperature typically ranges from 65-72 degrees Fahrenheit during peak summer months, requiring caution during early spring and late fall transitions. The lake's depth varies from gradual shallow zones near designated swimming areas to deeper sections reaching 25-30 feet in central portions. Best swimming spots include the main beach area with sandy entry and marked swimming zones that define safe perimeters. Water conditions remain relatively calm due to the lake's enclosed geography and windbreak provided by surrounding trees. Currents are minimal and manageable for recreational swimmers. Safety considerations include always swimming within designated areas and being aware of underwater vegetation in some zones. Seasonal lifeguard presence provides oversight during peak summer months. Swimmers should respect posted depth markers and avoid swimming alone.

Visitor Information

Union Lake is conveniently located approximately 40 minutes from Newark and 35 minutes from the Jersey Shore area, making it accessible from major New Jersey population centers. Parking is available with adequate space for weekend visitors, though arriving early is advisable during peak summer days. On-site facilities include restrooms, picnic areas with tables and grills, and a maintained beach zone. Nearby towns offer food options ranging from casual sandwich shops to full-service restaurants within 10-15 minutes. Accommodation options range from budget motels to comfortable bed and breakfasts in surrounding communities. The best time to visit is June through September when water temperatures peak and lifeguard services are operational. Late May and early September offer smaller crowds with pleasant conditions. Winter visits are possible but water temperature drops significantly, limiting comfortable swimming for most visitors.

Things to Do

Beyond the swim

SwimmingPicnic AreasFishingKayaking & Canoeing
Clear waterScenic surroundingsFamily friendlyFree entryPeaceful atmosphere

Plan Your Visit

A day trip or a full weekend at Union Lake

A Perfect Summer Day at Union Lake

Arrive by 9 AM to secure parking and enjoy the lake before afternoon crowds arrive. Spend the morning swimming in calm, clear waters within designated zones while the lifeguard is on duty. Pack a picnic lunch and relax at one of the shaded tables overlooking the water. The early afternoon offers ideal lighting for photography of the scenic lake environment. Late afternoon swims provide a quieter experience as day-trippers depart. Bring a book or simply enjoy the peaceful surroundings while drying off. Depart by 6 PM to avoid evening traffic returning to urban centers.

◆Clear water swimming experience
◆Scenic picnic by the lake
◆Peaceful family environment
Bring extra water and snacks as options nearby are limited. Apply sunscreen generously as there are limited shaded swimming areas.

Relaxing Weekend Getaway at Union Lake

Day 1

Arrive Friday evening and explore the lake's perimeter with a casual walk, observing the natural setting as the sun sets. Saturday morning, swim during optimal conditions with full lifeguard coverage. Spend the afternoon picnicking and relaxing on the beach. Evening activities include dining at nearby restaurants in adjacent communities.

☾ Overnight: Stay in nearby Manalapan or Englishtown, offering convenient lodging options 10-15 minutes from the lake with good restaurant selections.

Day 2

Sunday morning features a peaceful early swim with fewer crowds. Enjoy breakfast at a local diner before returning for one final swim session. Spend the afternoon exploring scenic walking trails around the lake before heading home.

Book accommodations in advance during peak summer weekends. Check weather forecasts as water conditions can change with seasonal storms.

Getting There

40.1042, -74.2671

What to Bring

sunscreentowelwater shoessnackscoolercamerainsect repellentfirst aid kit

Frequently Asked Questions

Is Union Lake safe for swimming?

Yes, Union Lake is safe for swimming with seasonal lifeguard presence during peak summer months. The water maintains clear conditions with designated swimming zones, and currents are minimal. Always swim within marked areas and respect posted safety guidelines.

What is the best time to swim at Union Lake?

The best swimming period is June through September when water temperatures reach 65-72 degrees and lifeguards are on duty. Late May and early September offer pleasant conditions with fewer crowds. Avoid winter months when water becomes too cold for comfortable recreational swimming.

Is there an entry fee at Union Lake?

No, Union Lake is completely free to access with no entry fees required. Parking is also free and accommodates approximately 100 vehicles on a first-come basis.

What facilities are available at Union Lake?

Union Lake offers restrooms, picnic areas with tables and grills, and a maintained sandy beach zone. Nearby communities provide additional services including food options and retail shops within short driving distance.

Can you camp near Union Lake?

Union Lake itself does not have on-site camping facilities. However, several campgrounds are located within 20-30 minutes of the lake in surrounding areas, making weekend camping trips feasible for visitors seeking overnight outdoor experiences.

📋 Sources & updates

Compiled from official park, state and lake-authority information.
Last checked 9 November 2026 · Conditions, fees and opening dates change – check with the lake manager before you go. Found something out of date? Send a correction.
🏊

Researched by the Swimming Lakes team

Our guides are compiled from official park, state and lake-authority sources, then checked and updated regularly. Spot something out of date? Send us a correction.

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Photo 1: Tomwsulcer (CC0), via Wikimedia Commons · Photo 2: ewan traveler (CC BY 2.0), via Wikimedia Commons · Photo 3: Emerson B. Garrison (Public domain), via Wikimedia Commons