- September 1, 1971
- September 2, 1971 (Snoopy appears as the World Famous Football Coach)
- September 3, 1971
- September 4, 1971
- September 5, 1971 (The third reference to Amy)
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- September 6, 1971
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- September 7, 1971 (This strip is adapted in There's No Time for Love, Charlie Brown and A Charlie Brown Celebration)
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- September 8, 1971
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- September 9, 1971
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- September 10, 1971
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- September 11, 1971
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- September 12, 1971 (The second reference to Citizen Kane in Peanuts)
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- September 13, 1971 (This series of strips are adapted in the episode "Lucy Loves Schroeder" from The Charlie Brown and Snoopy Show)
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- September 14, 1971
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- September 15, 1971
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- September 16, 1971
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- September 17, 1971
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- September 18, 1971
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- September 19, 1971
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- September 20, 1971
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- September 21, 1971
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- September 22, 1971
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- September 23, 1971
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- September 24, 1971
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- September 25, 1971
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- September 26, 1971 (Football gag for 1971)
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- September 27, 1971
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- September 28, 1971
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- September 29, 1971
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- September 30, 1971
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| ← August 1971 | October 1971 → |
