The Jewish calendar is unlike any other. While most of the world runs on the Gregorian solar calendar, Jewish life follows a unique lunar-solar system that has guided Jewish holidays, rituals, and traditions for thousands of years. That’s why the Jewish New Year, Rosh Hashanah, falls in September or October instead of January, and why Passover always lands in the spring.
In this guide, we’ll explain how the Jewish (or Hebrew) calendar works and how it continues to shape Jewish identity today!
Time in Judaism is more than a way to mark days – it’s a rhythm of sacred moments. The Jewish calendar shapes every holiday, season, and cycle of Jewish life, from Rosh Hashanah to Passover, and has been guiding the Jewish people for thousands of years.
What makes it unique is the way it blends the cycles of the moon and the sun. Rooted in the Torah’s commandment to sanctify the new moon, the calendar is lunar at its core, with months that follow the waxing and waning of the moon. Yet it also keeps pace with the solar year to ensure that holidays arrive in their proper seasons. This careful balance of lunar, solar, and sacred time makes the Jewish calendar unlike any other, and it remains central to Jewish identity and tradition.
Each Hebrew month in the Jewish calendar lasts 29 or 30 days, corresponding to the phases of the moon. But 12 lunar months total only about 354 days – shorter than the solar year. Without adjustment, the holidays would shift across the seasons.
To solve this, the Jewish calendar follows a 19-year cycle. Seven times within that cycle, an extra month – called Adar II – is added. This leap month keeps the calendar aligned with the solar year, ensuring that holidays like Passover always fall in the spring and Sukkot always comes in the fall. This remarkable system has preserved the sacred rhythm of Jewish time for millennia.
The Jewish year is made up of 12 months, or sometimes 13 in leap years. Each month carries its own spiritual themes and is tied to specific holidays:
Tishrei – The month of the High Holidays: Rosh Hashanah, Yom Kippur, Sukkot, and Simchat Torah
Cheshvan – A quieter month, with no major holidays
Kislev – The month of light, home to Hanukkah
Tevet – Includes the fast of the Tenth of Tevet
Shevat – Known for Tu BiShvat, the New Year of the Trees
Adar (Adar I & II in leap years) – The joyous month of Purim
Nisan – The month of redemption, home to Passover
Iyar – The counting of the Omer and Israel’s modern holidays including Independence Day
Sivan – The month of Shavuot, celebrating the giving of the Torah
Tammuz – Includes the fast of the 17th of Tammuz
Av – A month of mourning, with Tisha B’Av marking the destruction of the Temples
Elul – A month of reflection and preparation for the High Holidays
The cycles of the moon and sun remind us that time itself is sacred. The Jewish calendar teaches renewal, reflection, and a connection between the natural world and Jewish life. Every month offers its own spiritual opportunities, and every year is another chance to begin again.
As we will soon begin the Jewish year 5787, the calendar continues to guide us just as it has for generations. It is more than dates and months – it is the heartbeat of Jewish tradition, connecting past, present, and future in a rhythm that is truly lunar, solar, and sacred.
Get ready for the Jewish year with a beautiful Hebrew calendar from Israel, available on our site directly from Jerusalem!
And don't forget to shop High Holiday gifts, Jewish books, and Hebrew Bibles for a meaningful New Year!
