Why do Jewish holidays fall on different dates each year on the regular calendar?

Jewish holidays are set by the Hebrew calendar, which is lunisolar rather than solar. Because its months follow the moon, each holiday's date shifts relative to the Gregorian calendar from year to year, even though it always falls in the same season and the same point in the Hebrew calendar.

What is a Hebrew leap year?

A Hebrew leap year adds a 13th month, a second Adar, to keep the lunar calendar in sync with the solar year. This occurs seven times in every 19-year cycle so that holidays like Passover and Sukkot stay in their proper season.

What are the most significant Jewish holidays?

The most widely observed Jewish holidays include Rosh Hashanah and Yom Kippur (the High Holy Days), the three pilgrimage festivals Sukkot, Passover, and Shavuot, and the widely celebrated Hanukkah and Purim.

What is the difference between Rosh Hashanah and Yom Kippur?

Rosh Hashanah marks the start of the Jewish year and begins a ten-day period of reflection, while Yom Kippur, ten days later, is the Day of Atonement and the holiest day of the Jewish year, marked by fasting and prayer.

How can I find this year's Jewish holiday dates?

Jewish holiday dates change each year on the Gregorian calendar and can be found through Hebrew calendar tools and Jewish calendar resources, or through local synagogue and community event listings that post holiday schedules ahead of time.

The Jewish Year Explained: A Holiday Calendar Guide

Quick answer: The Jewish year follows the Hebrew calendar, a lunisolar system of 12 or 13 months that moves through an annual cycle of holidays — including Rosh Hashanah, Yom Kippur, Sukkot, Hanukkah, Purim, Passover, and Shavuot — each carrying its own history, rituals, and themes.

How the Hebrew Calendar Works

The Hebrew calendar is “lunisolar,” meaning its months follow the cycles of the moon while its years are kept in step with the solar year. Each month runs 29 or 30 days, matching the roughly 29.5-day lunar cycle. Because twelve lunar months add up to about eleven days less than a solar year, the calendar periodically adds a 13th month — a second month of Adar, called Adar I and Adar II — in leap years. This happens seven times within every 19-year cycle, in a fixed pattern (the 3rd, 6th, 8th, 11th, 14th, 17th, and 19th years of the cycle). The result is that Jewish holidays always land in their correct season on the solar calendar — Sukkot in the fall harvest season, Passover in the spring — even though their Gregorian calendar dates shift from year to year.

The High Holy Days: Rosh Hashanah and Yom Kippur

The Jewish year begins with Rosh Hashanah, the “head of the year,” which opens a ten-day period of reflection and repentance known as the Days of Awe. That period concludes with Yom Kippur, the Day of Atonement and the holiest day on the Jewish calendar, observed with a full day of fasting, prayer, and seeking forgiveness — both from God and from other people.

The Pilgrimage Festivals: Sukkot, Passover, and Shavuot

Three festivals are traditionally known as the “pilgrimage festivals,” historically marked by journeys to Jerusalem. Sukkot, a harvest festival, takes its name from the temporary huts (sukkot) that Jews build and dwell in, recalling the fragile shelters used during the biblical journey through the wilderness; it is traditionally followed by Simchat Torah, which marks the completion and immediate restart of the annual Torah reading cycle. Passover (Pesach), an eight-day festival built around the retelling of the Exodus from Egypt at a seder table, is among the most widely observed Jewish holidays across the entire spectrum of the community. Shavuot, occurring seven weeks after Passover, commemorates the giving of the Torah at Mount Sinai.

Hanukkah and Purim

Hanukkah, the eight-day Festival of Lights, commemorates the rededication of the Temple in Jerusalem after a small band of Jewish fighters overcame a much larger occupying force, and is marked by lighting a menorah each night. Purim celebrates the deliverance of the Jewish people in ancient Persia from a plot to destroy them, as told in the Book of Esther, and is observed with festive meals, costumes, and communal celebration.

Fasts and Other Days on the Calendar

Beyond the major festivals, the Jewish year includes several minor fast days and modern commemorations, along with joyful minor holidays like Tu BiShvat (marking the “new year for trees”) and Lag BaOmer. Together, these days give the Jewish year a rhythm that moves between solemn reflection and joyful celebration throughout the twelve — or thirteen — months.

Celebrating the Jewish Year in Community

However a family or individual chooses to mark these days, holidays are often best experienced in community. HeimishMart’s Jewish events listings are a good place to find local Rosh Hashanah services, Sukkot celebrations, Hanukkah parties, Purim carnivals, Passover seders, and more happening near you. Newcomers to an area can use the Community Explorer to find synagogues and communal life nearby, while those searching for a home in time for the holiday season can check real estate or rental listings close to a shul. Local caterers, event spaces, and holiday-related businesses can reach the community by choosing to add a listing, and anyone in need of support around the holidays can turn to chessed resources, while those seeking seasonal work can browse the jobs board.

Whatever a person’s level of observance, the Jewish year offers a shared calendar — a rhythm of remembrance, gratitude, and renewal that has connected Jewish communities across centuries and continents.

By the HeimishMart Community Desk — HeimishMart is the community marketplace for Jewish homes, jobs, and local life across North America.