The price of Bitcoin first reached $1 in February 2011.
At that time, Bitcoin was still in a very early stage of its development, and the market size was very limited compared to today. At the beginning of 2011, the price of Bitcoin ranged between $0.30 and $1, and the currency saw significant jumps in value during that year.
The price of Bitcoin reached $1 during the period when more people and investors began to learn about the digital currency and trade it.