When will BTC reach a new All-Time High?

Altseason Signal Fires as Bitcoin ETF Demand Stays Strong

The altseason signal crossing and record-setting ETF inflows both bear on whether Bitcoin can push to a new all-time high within the observation window this event tracks.

• US Bitcoin ETF logs near-$1B single-day inflow, largest since October 2025

  Per Farside Investors, US spot Bitcoin ETFs drew $999 million on Monday, the largest one-day haul since October 2025. Strong institutional demand flows directly into Bitcoin price support, reinforcing Bitcoin's structural advantage over altcoins in this cycle.

• Glassnode Altcoin Cycle Signal crosses altseason threshold at 81.25

  Glassnode's Altcoin Cycle Signal hit 81.25 this week, crossing into altseason territory. Glassnode noted the current rally has 'ignited the full breadth of the altcoin market,' unlike August's first leg when altcoins stayed flat while BTC moved.

• Polymarket gives slim odds to Bitcoin hitting $250K by year-end

  At 20:17 UTC on Sep 22, 2026, Polymarket's 'Will Bitcoin reach $250,000 by December 31, 2026?' contract (closing Jan 1, 2027, 12:00 AM EST (Jan 1, 2027, 05:00 UTC)) showed Yes at 0.9% and No at 99.1%, placing the current rally well short of a parabolic extension in market expectations.