Here are the Gregorian dates for the Biblical Feasts in 2023.
Feast dates are based on the Biblical Solar calendar.

Rosh Chodesh / Head of the Year / Head of Spring

1st Day of the First Month
Wednesday, March 22, 2023

Passover

14th Day of the First Month at Evening
End of the Day, Tuesday, April 4, 2023

Unleavened Bread

15th Day of the First Month for Seven Days
Wednesday, April 5 – Tuesday, April 11, 2023
The first day (April 5) and the seventh day (April 11) are Sabbaths

First Fruits of Barley

26th Day of the First Month
Day After the Sabbath After Unleavened Bread
Sunday, April 16, 2023

Shavuot / Feast of Weeks / First Fruits of Wheat

15th Day of the Third Month
50 Days (inclusive) from First Fruits of Barley
Sunday, June 4, 2023

Rosh Chodesh / Head of Summer

1st Day of the Fourth Month
Wednesday, June 21, 2023

Feast of New Wine

3rd Day of the Fifth Month
50 Days (inclusive) from First Fruits of Wheat
Sunday, July 23, 2023

Feast of New Oil

22nd Day of the Sixth Month
50 Days (inclusive) from Feast of New Wine
Sunday, September 10, 2023

Wood Offering

23rd Day of the Sixth Month for Six Days
Monday, September 11 – Saturday, September 16, 2023

Yom Teruah / Feast of Trumpets
Rosh Chodesh / Head of Fall

1st Day of the Seventh Month
Wednesday, September 20, 2023

Yom Kippur / Day of Atonement

10th Day of the Seventh Month
(Begins the evening before on the 9th Day)
Friday, September 29, 2023

Sukkot / Feast of Tabernacles

15th Day of the Seventh Month for Seven Days
The first day (October 4) is a Sabbath
Wednesday, October 4 – Tuesday, October 10, 2023

Shemini Atzeret / Eighth Day Assembly

22nd Day of the Seventh Month immediately following Sukkot
Wednesday, October 11, 2023

Rosh Chodesh / Head of Winter

1st Day of the Tenth Month
Wednesday, December 20, 2023