What is latest shema?

The latest time to recite the morning Shema (Kriat Shema, the recitation of Shema) is, according to most authorities, the end of the third halachic hour of the day (sof zman Kriat Shema). This is calculated as one-quarter of the halachic day, which is typically measured either from sunrise to sunset or from alot hashachar (dawn) to tzet hakochavim (nightfall), depending on the opinion followed. Missing this time means one has lost the mitzvah of reciting Shema in its proper time, though one should still recite it afterward without a blessing.

Key Takeaways

The deadline for morning Shema is the end of the 3rd halachic hour of the day.
There is a dispute between Magen Avraham and the Vilna Gaon/Gra on how to calculate the halachic hour, leading to different end times.
If one missed the time, one should still recite Shema but without the associated blessings (berachot) counting as fulfilling the time-bound obligation.
The Talmud in Berakhot records this deadline, and the story of the Five Rabbis in the Haggadah dramatically illustrates how Seder night discussion went all the way until Shema time.
For precise times at your location, consult a zmanim calendar or app.

The Torah Source

The obligation to recite Shema twice daily comes from Deuteronomy 6:7:

"וּבְשׇׁׁכְבְּךָ֖ וּבְקוּמֶֽךָ" — "when you lie down and when you rise up."

[Deuteronomy 6:4-9] The phrase "when you rise up" establishes the morning window, and "when you lie down" establishes the evening window.

The Talmudic Ruling

The Mishnah in Berakhot (9b) establishes:

The morning Shema may be recited from when one can distinguish between blue (techelet) and white — until the end of the third halachic hour of the day.

The reasoning is that the "time of rising" (zman kumecha) refers to the period when people typically get up — which the Sages defined as the first quarter of the day.

Rabbi Yehuda extends this to four halachic hours; this is a minority position.

The Two Main Calculations

There is a famous dispute among the Rishonim and Acharonim about what constitutes a sha'ah zemanit (halachic hour):

1. Magen Avraham (MA)

The halachic day runs from alot hashachar (dawn, ~72 minutes before sunrise) to tzet hakochavim (nightfall).
This gives an earlier sof zman Kriat Shema.

2. Vilna Gaon (Gra) / Baal HaTanya

The halachic day runs from sunrise (netz) to sunset (shekiah).
This gives a later sof zman Kriat Shema — typically closer to what most people think of as mid-morning.

Most Sephardic authorities and many Ashkenazic poskim follow the Gra's calculation for the lechatchila (preferred) time, though one should be stringent with the Magen Avraham's earlier deadline where possible.

The Famous Story: Five Rabbis at B'nei Brak

The Pesach Haggadah records a striking story that illustrates how significant this deadline is:

"מַעֲשֶׂה בְּרַבִּי אֱלִיעֶזֶר וְרַבִּי יְהוֹשֻׁעַ וְרַבִּי אֶלְעָזָר בֶּן עֲזַרְיָה וְרַבִּי עֲקִיבָא וְרַבִּי טַרְפוֹן שֶׁהָיוּ מְסֻבִּין בִּבְנֵי בְרַק וְהָיוּ מְסַפְּרִים בִּיצִיאַת מִצְרַיִם כָּל אוֹתוֹ הַלַּיְלָה עַד שֶׁבָּאוּ תַלְמִידֵיהֶם וְאָמְרוּ לָהֶם רַבּוֹתֵינוּ הִגִּיעַ זְמַן קְרִיאַת שְׁמַע שֶׁל שַׁחֲרִית."

"It happened that Rabbi Eliezer, Rabbi Yehoshua, Rabbi Elazar ben Azaryah, Rabbi Akiva, and Rabbi Tarfon were reclining in Bnei Brak and were telling the story of the Exodus from Egypt all that night, until their students came and said to them: 'Our teachers! The time of the morning Shema has arrived!'" [Pesach Haggadah, Magid]

The Divrei Negidim comments on this passage that the rabbis were so absorbed in the beloved mitzvah of recounting the Exodus that time flew by — they didn't even notice the night had passed until their students arrived to remind them. [Divrei Negidim, Magid 1:1]

Rabbi Akiva's Ultimate Fulfillment

The Talmud records another powerful moment involving Shema and Rabbi Akiva:

"בְּשָׁעָה שֶׁהוֹצִיאוּ אֶת רַבִּי עֲקִיבָא לַהֲרִיגָה זְמַן קְרִיאַת שְׁמַע הָיָה... הָיָה מַאֲרִיךְ בְּ'אֶחָד' עַד שֶׁיָּצְתָה נִשְׁמָתוֹ"

"When they took Rabbi Akiva out to be executed, it was the time of Kriat Shema... he prolonged [the word] 'One' (Echad) until his soul departed." [Berakhot 61b]

This illustrates that sof zman Kriat Shema was so precisely observed that even at the moment of martyrdom, Rabbi Akiva fulfilled the obligation at its appointed time.

What If One Missed the Time?

Lechatchila (ideally): Recite Shema before the end of the third halachic hour.
Bedi'avad (after the fact): If missed, recite Shema until chatzot (halachic midday) — you fulfill the mitzvah partially according to some opinions.
After midday: One may still recite Shema as Torah study, but the time-bound obligation cannot be fulfilled retroactively.

For personal guidance on calculating zmanim for your location or for any practical halachic questions, consult your local rabbi or posek.