September social media holiday content calendar

Updated: Aug 31, 2021

September 2021 social media content calendar

As we bid adieu to summer, we welcome September and a new season. From back to school and preparing for sweater weather, fall is the beginning of a season of change.

This social media holiday and content calendar is here to help you track important dates in September. Use this to help you build out your social media content calendar for the month and as inspiration when you're unsure of what to post.

Click on any of the dates below to jump to the day or keep scrolling for important days and hashtags in September 2021, as well as social media post templates and template collections for every day this month.

Wednesday, September 1st 2021: Post your Labor Day sales

Get your customers ready for your Labor Day sales by sharing what you have on special.

Labor Day sales hashtag:


Labor Day sales social media post template collection:

Thursday, September 2nd 2021: Celebrate end of summer

The upcoming Labor Day weekend symbolizes the end of summer, so celebrate it with a post!

End of summer hashtag:


End of summer social media post templates:

Sunday, September 5th 2021: International Day of Charity

Post about your support in a philanthropic endeavor on this day.

International Day of Charity hashtag:


International Day of Charity social media post templates:

Monday, September 6th 2021: Labor Day

Create a post celebrating Labor Day on social media!

Labor Day hashtag:


Labor Day social media post template collection:

Monday, September 6th 2021: Rosh Hashanah begins

Lasting from September 6th-8th, Rosh Hashanah is the Jewish New Year. Post a message wishing your followers Shana Tova!

Rosh Hashanah hashtag:


Rosh Hashanah social media post templates:

Wednesday, September 8th 2021: Share a review

Reviews are a big part of many people’s purchasing decisions. Share a customer review to your feed to help!

Customer review hashtag:


Customer review social media post templates:

Friday, September 10th 2021: Promote your product

New followers might not know all the products and services you offer—promote it with a social post!

Promote your product hashtag:


Promote your product social media post templates:

Saturday, September 11th 2021: Patriot Day

2021 is the 20th anniversary of the September 11th attacks. Patriot Day is a day of remembrance of the people killed in the attacks.

Patriot Day hashtag:


Patriot Day social media post templates:

Sunday, September 12th 2021: National Grandparents Day

Celebrate the grandparents in your life or your specials and products aimed at grandparents.

National Grandparents Day hashtag:


National Grandparents Day social media post template:

Tuesday, September 14th 2021: Trendy Tuesday

Do you have a trending product or customer favorite? Create a post sharing why they love it.

Trendy Tuesday hashtag:


Trendy Tuesday social media post templates:

Wednesday, September 15th 2021: Yom Kippur begins

Wish those celebrating Yom Kippur “Yom Tov”, Hebrew for “Have a good holy day”.

Yom Kippur hashtag:


Yom Kippur social media post template:

Yom Tov social media template

Saturday, September 18th 2021: Share a fun fact