bitcoin dominance closed september at 59.17% after opening at 60.17% and tagging 58.92%, which keeps share inside the same 58-61% band it has held for a year, the monthly chart still has 57.8-58% as the line underneath that range, and 2017 and 2021 only paid alts when dominance left the high-50s and kept falling. 2025 never printed that drop, which is why that year sits marked as missing.

a monthly close through 57.8% that then holds is the rotation trigger, while a wick into 58% is just another test of the same range, if that line holds and share reclaims 61%, bitcoin keeps the lead and most alts lag, especially while etf demand still props bitcoin's slice of the market and has kept this coil alive for a year.

altseason is not a dominance dip by itself. the usual gauge still needs most of the top 50 beating bitcoin over 90 days, so a few names running at 59% is rotation rather than the 2017 tape. dominance can fall two ways: bitcoin stays firm while alts bid, or bitcoin sells and alts sell less. only the first is the tape you want.

watch the next monthly close against 57.8% and 61%. a break with bitcoin still bid is the start of rotation, a bounce back into 58-61% is another delay. the range is tight. the event is not confirmed.

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