Welcome to the vibrant seasons of autumn and winter in Mercer County, NJ! As the leaves change and the air grows crisp, communities throughout central New Jersey come alive with a rich variety of festivals, fairs, and holiday celebrations (many of which are free!). From charming harvest festivals in Princeton and Hopewell to festive tree lightings and holiday markets across Mercer County, there’s something for everyone to enjoy. Whether you’re exploring local orchards, enjoying live music, or gathering with family and friends, these seasonal events showcase the best of our region’s spirit and culture.

Gather Family and Friends for These Fun Events September–December 2025

Fall Family Fun Weekends

📍 Terhune Orchards, Princeton

📅 Saturdays and Sundays, September 6 – November 2, 2025

A classic fall experience with apple and pumpkin picking, hayrides, barnyard animals, live music, and seasonal treats for all ages. Learn more: Fall Family Fun Weekends

Hopewell Harvest Fair

📍 Hopewell Elementary School, Hopewell

📅 Saturday, September 20, 2025 (Rain date: October 4)

This charming small-town fair includes hayrides, a petting zoo, children’s games, food vendors, and displays from local businesses and community organizations. Learn more: Hopewell Harvest Fair

Central Jersey Family Fall Fest

📍 MarketFair, Princeton

📅 Sunday, September 21, 2025

Bring the whole family for games, food trucks (like Nomad Pizza & Damnpanadas), vendor booths, giveaways for early registrants, and a full day of fun for parents and kids alike. Learn more: Central Jersey Family Fall Fest

Central Jersey Beverage Fest

📍 Mercer County Park Festival Grounds, West Windsor

📅 Saturday, September 27, 2025

A beer lover’s dream with tastings of beers, wines, and seltzers. Enjoy food trucks, live music, and a lively crowd in a beautiful fall setting. Learn more: Central Jersey Beverage Fest

Princeton Green House Tours

📍 Various Locations, Princeton

📅 Saturday, September 27, 2025

Explore sustainable living through this self-guided tour of eco-friendly homes and gardens, hosted by the Princeton Environmental Commission and Sustainable Princeton. Learn more: Princeton Green House Tours

FOPOS Fall Fest

📍 Mountain Lakes House, Princeton

📅 Sunday, September 28, 2025

Celebrate nature with live music, plant-based foods, craft beverages, and outdoor-themed activities. Proceeds support the Friends of Princeton Open Space. Learn more: FOPOS Fall Fest

School of Rock Princeton Fall Festival

📍 School of Rock, Princeton/Lawrence Township

📅 Saturday, October 5, 2025

A fun-filled family event with live student performances, games, local food vendors, and interactive activities for kids and parents alike. Learn more: School of Rock Princeton Fall Festival

Cranberry Festival

📍 Downtown Bordentown, NJ

📅 October 4–5, 2025

A two-day festival celebrating Bordentown’s cranberry-growing heritage. Expect artisan vendors, music, food, and community spirit. Learn more: Cranberry Festival

Allentown Fall Festival

📍 Downtown Allentown, NJ

📅 October 11–12, 2025

An autumn celebration with local food, crafts, kids’ activities, and plenty of seasonal charm in historic Allentown. Learn more: Allentown Fall Festival

Princeton Fall Fest

📍 Palmer Square, Princeton

📅 Sunday, October 12, 2025

Enjoy live performances from local musicians, fall-themed crafts, seasonal decorations, and delicious food in the heart of downtown Princeton. Learn more: Princeton Fall Fest

Oktoberfest (Hamilton Township)

📍 Veterans Park South (Kuser Road Entrance), Hamilton Township

📅 Sunday, October 19, 2025 (Rain date: October 26)

Celebrate fall at this lively community festival featuring a pumpkin patch, hayrides, corn maze, food trucks, vendor booths, live music, a craft beer garden, and family-friendly activities. Learn more: Oktoberfest (Hamilton Township)

Halloween Run and Walk

📍 502 Carnegie Center, Princeton

📅 Saturday, October 25, 2025

Choose a timed 5K or a relaxed 1-mile walk to support children facing poverty and homelessness. Includes a festive Halloween-themed course, live music, trunk-or-treat, and a preschool pumpkin dash. Learn more: Princeton Halloween Run and Walk

Holiday Tours at Fonthill Castle

📍 Fonthill Castle, Doylestown, PA

📅 November 15 – December 31, 2025

Take a candlelit tour of the historic Fonthill Castle adorned with holiday décor. A unique way to experience the charm of the season in a beautifully preserved setting. Learn more: Holiday Tours at Fonthill Castle

Palmer Square Annual Tree Lighting

📍 Palmer Square Green, Princeton

📅 Friday, November 28, 2025

Princeton’s iconic holiday celebration featuring the lighting of the downtown tree with live entertainment and community gathering. Learn more: Palmer Square Annual Tree Lighting

Christmas Tree Lightings & Holiday Ceremonies

📍 Various Towns in Mercer County

📅 Late November to Early December

Join communities for festive tree lightings with live music, choirs, crafts, refreshments, and holiday cheer. Popular spots include Kuser Farm Mansion, Robbinsville Senior Center, and West Windsor. Learn more:

Winter Wonderland

📍 Kuser Farm Park, Hamilton Township

📅 December 5–6, 2025

Experience holiday magic with festive lights, tree lighting, train rides, petting zoo, photo ops with Santa, and charitable events like toy drives. Free admission. Learn more: Winter Wonderland

Preparing for a Cozy Fall and Winter Season in Mercer County, NJ

As the cooler months approach and you find yourself spending more time cozying up at home, it’s important to ensure your heating system is running efficiently and reliably. Indoor Air Technologies is here to support homeowners in Mercer County and the surrounding areas in staying warm and comfortable throughout the fall and winter seasons.

If you need any assistance with your heating system maintenance, emergency repairs, or complete replacement, don’t hesitate to reach out! Simply call us at 609-808-4759 or fill out our convenient contact form.