When Is Tu Bishvat 2025. Tu bishvat, or rosh hashanah la'ilanot, is celebrated at the following dates: Tu bishvat, or the new year of the trees, is jewish arbor day.
• in the jewish calendar, a holiday begins on the sunset of the previous day, so observing jews will celebrate tu bishvat. Tu b’shevat is observed on the 15th day of shevat, the eleventh month of the jewish calendar.