Sizdah Be-dar

Sizdah Bedar (Persian: سیزده‌بدر, romanized: sīzdæh bedar, lit. 'thirteen outdoor'), also known as Nature's Day (روز طبیعت, rūz-e tabī'at), is an annual Iranian festival held thirteen days after Nowruz, which is on the thirteenth day of Farvardin, the first month of the Iranian calendar (and the first month of spring), during which people spend time picnicking outdoors. It marks the end of the Nowruz holidays in Iran. While it is celebrated thirteen days after Nowruz in Iran, it is generally celebrated on a weekend day near the thirteenth day by the Iranian diaspora.