The best time to go to Fossil, Oregon, is during the spring (late April to early June) and autumn (September to early October) for comfortable weather and pleasant outdoor activities.Spring brings mild temperatures, typically ranging from 10°C to 20°C, making it ideal for exploring the John Day Fossil Beds National Monument without the intensity of summer heat. The landscape is often green and wildflowers begin to bloom, adding to the scenic beauty. This period is particularly good for families as the weather is agreeable for outdoor adventures like fossil hunting in the public access areas or short hikes.Autumn offers similar mild conditions, with temperatures generally between 10°C and 22°C. The days are usually sunny, and the cooler evenings are great for stargazing, which Fossil is well-known for due to its dark skies. The changing colours of the foliage in the surrounding areas also make for a picturesque visit.