The best time to go to Osowiec is during the late spring (May to June) or early autumn (September to October).These months offer pleasant weather conditions, with comfortable temperatures and less rainfall, making it ideal for exploring the outdoor attractions around Osowiec. The natural beauty of the Biebrza National Park, which surrounds the area, is particularly appealing during these times, with lush greenery in spring and vibrant colours in autumn.For those interested in wildlife observation, late spring is prime time for birdwatching as many migratory species return to the Biebrza Marshes for breeding. The longer daylight hours also allow for more extensive exploration of the park's trails and observation towers.Early autumn provides a different but equally rewarding experience, with fewer crowds and the chance to witness the changing foliage.