Seven of nine years: what Uptober actually delivered for Bitcoin, Ethereum, Solana and XRP

With October 1 the same word comes back every year: Uptober, the claim that October is the reliably strong month in the crypto market and the fourth quarter the strong season. We ran the numbers for the four largest tradable coins over nine years, in each case from the September 30 close to the December 31 close, and additionally for October on its own. The result splits in two. For Bitcoin the claim does hold up in October, with seven of nine years in the black. For the full quarter it barely holds, and for XRP it does not hold at all. This calculation is not a forecast. What has been counted is how often something happened in the past and, above all, how far the individual years lie apart. Base a decision on a season and you are basing it on an average that never arrived in any single year. What Uptober claims, and how the claim can be measured Behind the word sits a seasonality thesis: certain months deliver better returns on average than others, because capital flows, tax deadlines and expectations repeat over the course of the year. Seasonality in statistics means that a time-series value depends systematically on the calendar and not only on chance. Two measures make that testable, and the order matters. The first is the hit rate: in how many years did the period end in the black? The second is the median, the value in the middle of all years. The median says more here than the average, because a single extreme year shifts the average at will while leaving the median alone. That is exactly what happens regularly in the crypto market, and further down you will see how strongly. Bitcoin in October: seven of nine years in the black, median 10.9 percent For October on its own, the picture at Bitcoin is as clear as the word promises. From 2017 to 2025 the month closed higher than it opened seven times; only 2018 and 2025 ended in the red. The median sits at plus 10.9 percent. 2017: plus 48.5 percent · 2018: minus 4.6 · 2019: plus 10.3 2020: plus 28.1 · 2021: plus 40.0 · 2022: plus 5.5 2023: plus 28.5 · 2024: plus 10.9 · 2025: minus 4.0 Seven out of nine is a rate nobody can argue away. What it is not is a guarantee for the tenth case. Two losing years in nine means that on average every fourth or fifth October runs against the thesis, and the most recent one did. The full quarter comes out much weaker than October alone Here the picture tips.