Millbrook students also have the opportunity to participate in the shorter-term programs including: American Field Service, Youth for Understanding, World Horizons, Interlochen, Visions International, Where There Be Dragons, Teton Science School, World Learning, The School for Field Studies, Putney Student Travel, Outward Bound, Carnegie Mellon Summer Pre-College Program for Theater and Acting, Rustic Pathways, Trails Wilderness, Deer Hill Expeditions, ACS British Studies, Broadreach, and Academic Study Associates at Stanford and Oxford.
Millbrook faculty also sponsor off-campus educational trips during school breaks and over the summer. Recently, Millbrook faculty members have sponsored scientific data-collecting trips to Mongolia, down the Amazon, and to Machu Picchu, and the Bahamas, as well as cultural studies trips to Cambodia, Italy, Mexico, and Costa Rica. Even the baseball and lacrosse teams travel south during spring break to warm up for the coming season.