1 Shevat -Moses repeats the Torah: On the first of Shevat of the Hebrew year 2488, according to the Book of Deuteronomy, Moses convened the Jewish people and began the 37-day "review of the Torah", which he concluded on the day of his death on Adar 7 of that year.
15 Shevat - Tu Bishvat It is also called "Rosh HaShanah La'Ilanot" (Hebrew: ראש השנה לאילנות), literally "New Year of the Trees." In contemporary Israel this day is celebrated as an ecological awareness day and trees are planted in celebration.
24 Shevat - (517 BCE) - Zechariah's prophecy: According to Zechariah 1:7-16, "On the 24th day of the 11th month, which is the month of Shevat, in the second year of the reign of Darius, the word of God came to Zachariah the son of Berechiah the son of Ido the prophet, saying: '...I will return to Jerusalem in mercy, my house will be built within her" This was two years before the completion of the Second Temple on the 3rd of Adar, 515 BCE.
28 Shevat - (second century BCE) - Hasmonean holiday: On Shevat 28 (134 BCE?), Antiochus V abandoned his siege of Jerusalem and his plans for the city's destruction. This day was observed as a holiday in Hasmonean times.