The 2025 NEURON Spring Course will be held at the Tempe campus of Arizona State University from Sunday, March 9, through Friday, March 14, 2025. This is basically the NEURON Summer Course but happening at a different time of the year. It will provide a thorough introduction to computational modeling of neurons and networks with NEURON, and is suitable for individuals at all levels of expertise. The registration deadline is Friday, February 28, 2025. No applications will be accepted after that date, and there will be no on-site registration. Space is limited, and applications will be considered in the order received. For more information and the on-line application form, see: The 2025 NEURON Spring Course<https://www.neuron.yale.edu/phpBB/viewtopic.php?p=20497>