If you have ever wondered what is the month of Adar, you are in good company. The Hebrew calendar blends lunar and solar cycles, and Adar occupies a special place as the month that often carries the charge of celebration, memory, and anticipation ahead of the festival of Passover. In this article, we explore what is Adar in all its facets: its position in the year, how it behaves in leap years, the major holidays and observances tied to it, and practical guidance for reading calendars and planning around Adar. You will find detailed explanations, practical tips, and authoritative notes on the distinctive features that make the month of Adar unique.
What is Adar? Defining the Month in the Hebrew Calendar
Adar is a month in the Hebrew calendar that sits toward the end of the winter–early spring period in the Northern Hemisphere. It is traditionally the month that leads into Nisan, the month of Passover, and it sits between Shevat and Nisan in the yearly sequence. The standard, non-leap-year order of months in the calendar is: Tevet, Shevat, Adar, Nisan, Iyar, Sivan, Tammuz, Av, Elul, Tishrei, Cheshvan, Kislev, and back to Tevet. In leap years, the sequence introduces Adar I and Adar II, which shifts later months accordingly.
When people ask what is Adar’s role in the year, the simplest answer is that Adar is the month that bridges the winter-to-spring transition with a strong cultural and religious pulse. It is a month that, depending on the year, can feel like a time of quiet preparation or a season of focused celebration. In practical terms, Adar commonly has 29 days in a common (non-leap) year, while the leap-year pattern inserts a second Adar (Adar II) after Adar I, extending the year and allowing Purim to be observed in Adar II.
Adar in the Year: Length, Position, and Leap-Year Dynamics
Length and structure
Common year (non-leap): Adar lasts for 29 days.
Leap year: The month is divided into two consecutive months—Adar I and Adar II.
Adar I typically has 30 days, while Adar II has 29 days.
In a leap year, the order shifts so that Adar I comes first, followed by Adar II, and then Nisan.
The reason for this tweak is rooted in the lunisolar design of the Hebrew calendar. The calendar must stay aligned with both lunar months (which are roughly 29½ days) and the solar year (so that holidays stay in their seasonal places). The result is a carefully engineered rhythm: the presence or absence of Adar II affects the timing of Purim, Shabbatot, and several other observances.
Adar’s placement in the civil year and in the religious year
In the civil year, Adar is the month immediately preceding Nisan, the month of redemption and renewal in the Passover cycle.
In the religious year, Adar is the month where a strong celebration around Purim unites communities, with the fast of Esther preceding the festivity in most traditions.
During a leap year, Adar II becomes the month in which Purim is celebrated, while Adar I passes quietly as a preparatory month for the more intense Purim celebrations in Adar II.
The Hebrew calendar uses a 19-year cycle to reconcile the lunar months with the solar year. Every few years, a second month is inserted to keep holidays in their ordained seasons. This is the reason Adar I and Adar II appear in leap years. The addition ensures that Passover, which is tied to the spring season, does not drift too far from its seasonal anchor.
Purim timing in a leap year
In a leap year, the timing of Purim shifts to Adar II. This means that the celebrations that accompany Purim—grace notes like giving gifts (mishloach manot), charity (matanot la-evyonim), and feasting—occur in Adar II rather than Adar I. The month Adar II holds the primary Purim in most traditional communities; however, the idea of two Adars creates a distinctive cadence: a preparatory Adar I and the principal Purim in Adar II.
Purim Katan and other practices in leap years
Some communities observe a lesser form of Purim, known as Purim Katan, on a day in Adar I (often the 14th of Adar I) during leap years. This is not universal, and the observance varies by tradition and locality. For many, the focus remains on Purim in Adar II, with Adar I serving as a month of preparation and transition.
Observances and Celebrations: What Happens in Adar
Purim: The centerpiece of Adar
The holiday of Purim is the standout event in Adar. It commemorates the events chronicled in the Book of Esther, where the Jewish people were saved from annihilation in the ancient Persian empire. In most communities outside Jerusalem, Purim falls on the 14th of Adar (the eve of Purim). In Jerusalem and other ancient walled cities, the holiday is celebrated on the 15th of Adar, known as Shushan Purim. This distinction gives Adar a rich, multi-layered calendar texture: festive readings, costume parades, feasting, charity drives, and joyous communal gatherings.
In leap years, Purim in Adar II is the focal point for most communities, with the custom that many of the special Purim practices—reading the Megillah, performing acts of charity, giving gifts of food, and enjoying communal meals—are concentrated in Adar II rather than Adar I.
Ta’anit Esther: The Fast Before Purim
The fast of Esther is observed on the 13th of Adar in many traditions, as a day of fasting and reflection preceding the Purim festivities. The intent is to recall the peril faced by the Jewish people and to prepare the heart for the celebratory relief that Purim brings. As with other Hebrew calendar observances, specifics can vary by tradition and locale, but the 13th of Adar is widely recognized as the Fast of Esther in many communities.
Other observances and seasonal notes in Adar
Rosh Chodesh Adar marks the beginning of the month and can be a moment of increased prayer and community assembly, as with other months in the Jewish calendar.
Purim Katan appears in some leap-year practices as a minor Purim during Adar I, offering a lighter, preparatory flavor before the main Purim celebration in Adar II.
People often notice a seasonal feel in Adar, as the month sits at the threshold of spring in many climates, bringing a mood that combines introspection and exuberant festivity.
The term Adar traces its roots to ancient Near Eastern calendars and has been retained in Hebrew tradition for centuries. Some scholars connect the name with Mesopotamian or Babylonian month-naming practices, while others interpret it through a Hebrew lens that ties the month to seasonal and agricultural cues. In any case, Adar’s designation has been stable enough to endure through generations, surviving the transition from purely Babylonian methods to a structured Hebrew calendar that is still in use today.
The month of Adar is often associated with a sense of uplift and communal resilience, largely because Purim embodies the triumph of survival over danger through courage, charity, and solidarity. The liturgical readings and prayers around Adar reflect this mood: a period of heightened celebration, a focus on communal obligations (such as gifts to the needy), and the seasonal expectation of spring’s arrival.
Practical Guide: How to Read and Plan Around Adar
How to identify Adar on a Hebrew calendar
Locate the row or column that corresponds to the current year type (whether it is a common year or a leap year).
In a common year, you will see Adar as a single month with usually 29 days.
In a leap year, you will see Adar I followed by Adar II. Adar II is when Purim is typically celebrated; Adar II contains most of the Purim-related mitzvot and celebrations.
Note the Purim date in Adar II, which anchors the festival for leap-year communities.
Check local traditions for the precise dates of Ta’anit Esther and Purim Katan, if observed.
Planning around Adar: practical considerations
For families and communities planning events, ensure that major Purim activities are scheduled in Adar II during leap years, if you observe Purim primarily in Adar II.
For those who observe Ta’anit Esther, mark the 13th of Adar (or the date your tradition uses) on calendars and reminders.
In cities with historical traditions (like Jerusalem), be aware of the Shushan Purim schedule on the 15th of Adar, which can affect school and community calendars.
Businesses and schools in areas with large Jewish populations often incorporate Purim-related holiday closures or altered hours around Purim in Adar II or Adar; planning ahead helps avoid scheduling conflicts.
Frequently Asked Questions About Adar
Is Adar always the same length?
No. In a common year Adar has 29 days. In a leap year, the calendar splits Adar into Adar I (30 days) and Adar II (29 days), changing the total number of days in the year and the order of subsequent months.
What is the difference between Adar and Adar II?
The primary difference is where Purim occurs and how the months are arranged. In a leap year, Adar II is the month during which Purim is celebrated for most communities, whereas Adar I is a preceding month used to maintain the calendar’s alignment. If you are studying a Hebrew calendar or planning a schedule, the distinction between Adar and Adar II is essential for accurate dating.
Why does Adar matter in the Jewish calendar?
Adar matters not only because of Purim but also because it marks a transitional moment before the Passover season. It is a period of heightened communal and charitable activity, spiritual preparation, and seasonal change. The presence of Adar II in leap years emphasizes the calendar’s careful interweaving of lunar cycles with solar timing, ensuring that holidays occur in their intended seasons.
Historical Context and Modern Observance
Historical evolution of Adar in different communities
Across Jewish history, the month of Adar has connected a variety of traditions from the ancient Near East to modern observances. In many communities, Purim has historically been a robust, joyous celebration that includes public readings, carnival-style attire, and street processions. The concept of two Adars in leap years developed to maintain seasonal alignment, and it has become an accepted feature of contemporary calendars. The variation between Adar I and Adar II reflects both the resilience and adaptability of Jewish calendrical practice.
The liturgical cycle during Adar emphasizes a transition from the more solemn fast of Esther to the rabbinic and communal celebrations of Purim. There are readings of the Megillah (Scroll of Esther), recitations of prayers for relief and gratitude, and a communal emphasis on charity. In walled cities, the Shushan Purim festivities add a distinctive texture to the month’s religious experience.
Variations Across Regions: Israel, Diaspora, and Local Traditions
Israel and Shushan Purim
In the State of Israel, Purim is commonly observed on 14 Adar, but in Jerusalem and other ancient walled cities, Shushan Purim is celebrated on 15 Adar. This regional distinction contributes to a richer, more layered calendar in which different communities may experience the same month with slight shifts in timing.
The Diaspora’s rhythm
For many Jewish communities outside Israel, Purim is celebrated on 14 Adar, and Ta’anit Esther is observed on 13 Adar. The presence of Adar II in leap years can influence planning for synagogues, schools, and cultural events in these communities as well, particularly for organizations that coordinate with Israeli calendars or that host cross-cultural programming.
Key Takeaways: Quick Reference for What is the Month of Adar
Adar is the month that typically precedes Nisan in the Hebrew calendar and marks a transition toward spring in many climates.
In common years, Adar lasts 29 days; in leap years, the month is split into Adar I (30 days) and Adar II (29 days).
Purim, the central holiday of Adar, is celebrated in Adar II during leap years and in Adar (the single Adar) in non-leap years according to most traditions; in Jerusalem’s Shushan Purim, the date can be 15 Adar.
The Fast of Esther typically occurs on the 13th of Adar in many communities, regardless of whether Purim is celebrated in Adar or Adar II in a given year.
Adar is a time for generosity, communal joy, and preparations for Passover, with the exact calendar details varying by year type and by regional tradition.
In-Depth: A Glossary of Terms Related to Adar
– The month before Nisan; in leap years, Adar is split into Adar I and Adar II.
– The first Adar in a leap year; typically 30 days.
– The second Adar in a leap year; Purim is celebrated here in most communities.
– The festival celebrating survival and reversal, marked by readings, feasting, charity, and costume-wearing.
– Purim celebration in walled cities on the 15th of Adar.
– The Fast of Esther, traditionally observed on the 13th of Adar in many communities.
– A minor Purim observed by some communities on certain days in Adar I during leap years.
and Kislev – Months surrounding Adar; their lengths influence the overall calendar pattern that yields Adar’s placement each year.
Understanding what is the month of Adar and how it operates within the Hebrew calendar helps people plan holidays, study cycles, and communal events with clarity. Whether you approach Adar as a time of festive Purim, a moment of spiritual preparation for Passover, or simply as a marker in a lifelong calendar, the month offers a blend of tradition, calculation, and human experience. The interplay between Adar I and Adar II in leap years highlights the calendar’s sophistication and its enduring capacity to adapt to the rhythms of time while preserving the sacred order of holidays.
Por Laura Jara 
