Are presidential primaries not held on the same day?

In 2024 there will be another presidential election, but states are already gearing up for those primaries.
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During primary season, each state and sometimes each party does its own thing.

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2020 Democratic Party presidential primaries - Wikipedia

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Are presidential primaries not held on the same day?

2016 Republican Party presidential primaries - Wikipedia

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New Hampshire's first-in-the-nation 2024 primary will be held Jan. 23 - CBS News