The best time to see the Northern Lights in 2025 is generally from late September through March, with the peak months being December, January, and February [adventureworld.com]. The optimal viewing period coincides with the long, dark winter nights, especially between November and February, which offer the best conditions for sightings [lonelyplanet.com].

Key Factors for Viewing

• The darkest months with extended darkness, particularly during the winter solstice around December 21, are ideal.
• February often provides the most favorable conditions, balancing cold, clear skies, and long nights.
• The best time of night is typically between 10 pm and 2 am, when geomagnetic activity tends to be highest [adventureworld.com].

Additional Tips

• Avoid full moon phases for clearer visibility.
• Clear, cloudless skies and minimal light pollution enhance the chances.
• Consider locations above the Arctic Circle, such as Norway, Sweden, Finland, and parts of Canada, which are known for frequent aurora sightings [visitnorway.com].

In summary, for the highest probability of witnessing the Northern Lights in 2025, plan your trip between late September and March, with peak months being December, January, and February, especially during new moon phases and clear winter nights.