The Feast of Trumpets, known in Hebrew as Yom Teruah, falls on the 1st day of Tishri, the seventh month of the Hebrew calendar; many communities also call the day Rosh Hashanah or the Jewish New Year, and both names are widely used in liturgy and common speech.
The Torah commands one day of trumpet-blowing, but modern practice and synagogue liturgy often treat the day as Rosh Hashanah; the biblical phrase is a single festival day while rabbinic and communal usage applies both labels to the same date.
Pinpointing the Feast of Trumpets on the calendar: the exact Hebrew day and common English names
The Feast of Trumpets is fixed to Tishri 1 on the Hebrew calendar; that is the canonical day for the command of “a day of blowing.”
Yom Teruah is the direct Hebrew name; Rosh Hashanah is the common English name meaning the head of the year, and you’ll see both used by rabbis, calendars, and community schedules.
Why the Feast’s Gregorian date moves every year: lunar months, leap months and the Hebrew lunisolar system
The Hebrew calendar is lunisolar: months follow the moon (~29.5 days per lunar month) while the year is aligned to the sun by inserting a leap month (Adar II) seven times in a 19-year cycle, so Tishri 1 shifts against the Gregorian calendar.
Because of lunar months and occasional Adar II insertions, Tishri 1 most often falls in September or October, but it can move by several weeks from one Gregorian year to the next.
Key calendar terms to know: molad (the calculated lunar conjunction), Adar II (the added leap month), and the 19-year Metonic pattern used for conversion and prediction.
Rabbinic calendar rules and postponements that affect the date you’ll actually celebrate
The fixed rabbinic calendar, formalized under Hillel II, applies set rules and postponements called Dechiyot that can shift the start of Tishri by a day to avoid inconvenient weekdays.
The mnemonic Lo ADU Rosh expresses the rule that Rosh Hashanah does not begin on Sunday, Wednesday, or Friday; those postponements alter which Gregorian date corresponds to 1 Tishri.
Because of these Dechiyot and the calendar algorithm, the public observance date today is set by calendar math rather than direct, nightly astronomical observation.
How many days people observe the Feast of Trumpets and why it’s sometimes two days
The Torah specifies a single day, but historically communities observed two days (the yomim tovim sheniot practice) because the new moon could not always be verified immediately.
Today most Jewish communities outside Israel observe two days of Rosh Hashanah; that two-day custom is a rabbinic and calendrical practice rather than a second biblical day of the festival.
In Israel the festival is observed for one day according to ancient geographic practice, while the diaspora custom of two days persists in many communities worldwide.
Typical daily timing and synagogue rituals: shofar blowing, prayers, and special liturgy
The shofar is sounded during the morning synagogue service, generally after the Torah reading and during the Musaf service; communities vary in the exact placement and number of blasts.
Standard blast types are tekiah (a long single blast), shevarim (three medium blasts), and teruah (a rapid series of short blasts); many prayers include patterned combinations of tekiah, shevarim, teruah to fulfill the command.
Other timing customs include tashlich (an afternoon ritual of symbolic casting off of sins, often near running water) and an expanded Musaf service; observant communities restrict work similarly to other major festivals, though exact practice varies by denomination.
Scriptural and historical sources tying the date to Israelite practice
The Torah references are explicit: Leviticus 23:23–25 and Numbers 29:1–6 command a “day of blowing” on the first day of the seventh month, linking trumpet sounds to the festival date.
Temple-era practice included sacrificial offerings and trumpet signals, while later rabbinic interpretation defined the shofar patterns, liturgy, and the formal role of the day in the yearly cycle.
How to find the exact Gregorian date for the Feast of Trumpets in any year
Use reliable converters and calendars such as Hebcal, the Chabad calendar, your local synagogue calendar, or the Jewish Agency calendar to map Tishri 1 to the Gregorian date for a given year.
Search suggestions that work well: “Rosh Hashanah date [year]” or “Yom Teruah date [year]”; those queries return calendar matches, candle-lighting times, and community schedules.
For mobile use enable Jewish calendar overlays in your phone calendar, add a Hebcal widget, or install a Jewish calendar app so Tishri 1 appears alongside your regular events.
Practical planning: work, travel, food customs and community variations for the Feast
Rosh Hashanah is not a fast day; customary foods include apples dipped in honey, round challah, and holiday meals that emphasize sweetness and a good year.
Synagogue attendance is high; many communities require early reservations for seat availability and special high-holiday services, so book seats and travel early.
Work restrictions vary: Orthodox communities observe full holiday work prohibitions, Conservative and Reform practices differ by individual and community—check your rabbi or synagogue schedule before planning work or travel.
Common timing questions people ask and short, authoritative answers
Does the Feast fall on the same Gregorian date each year? No. Tishri 1 moves relative to the Gregorian calendar because the Hebrew months follow the lunar cycle and leap months shift the year.
Why can it fall as late as October? A combination of lunar timing, the insertion of Adar II in leap years, and rabbinic postponement rules can push 1 Tishri later into the Gregorian year.
Is it always observed for two days? Not always. The Torah prescribes one day; most diaspora communities keep two days as a rabbinic custom, while Israel commonly observes a single day.
If there’s any local doubt about exact observance days and service times, verify with an authoritative Jewish calendar or contact your local synagogue or rabbi directly.
Quick reference checklist for readers who only want to know when to observe the Feast of Trumpets this year
1) Verify Tishri 1 on a trusted Jewish calendar such as Hebcal, Chabad, or your synagogue’s posted calendar for the current year.
2) Note whether your community observes one day or two days (Israel typically one, diaspora often two) and confirm local practice with the rabbi or synagogue website.
3) Check synagogue service times and whether the shofar will be sounded on the morning you plan to attend; reserve seats if required.
4) Plan meals and time off: Rosh Hashanah is not a fast day, so arrange holiday meals like apples and honey and schedule travel early to avoid sold-out services or limited accommodation.
5) Bookmark a dependable calendar source and add a Jewish calendar overlay to your phone to see Tishri 1 mapped to the correct Gregorian dates year after year.
