The best time to visit Allenstown, New Hampshire, is during the summer months, from June to August, or in the autumn, from September to October.Summer offers pleasant temperatures, typically ranging from 20°C to 28°C, making it ideal for outdoor activities. Days are long, providing ample time to explore Bear Brook State Park, which is a major attraction with hiking trails, fishing ponds, and opportunities for wildlife spotting. Families will find this time particularly enjoyable for camping, swimming, and picnicking in the park's designated areas.Autumn brings stunning foliage, with the landscape transforming into a vibrant display of reds, oranges, and yellows, usually peaking in early to mid-October. The temperatures are cooler, around 10°C to 18°C, which is great for scenic drives along Route 28 or leisurely walks through the wooded areas of Allenstown.