Krohn comes from a motorsport central family, with his father, Pertti, competing in the 1987 Finnish Formula Ford championship alongside 1998 and 1999 Formula One world champion Mika Häkkinen whilst his sister, Jenni, and brother, Oskari also compete in motorsport professionally in Finland. Jesse Krohn was born in Nurmijärvi, located in the southern Uusimaa region of Finland, during September 1990. His father, Pertti Kurki-Suonio was a racing driver.
He is notable for winning the Finnish, Northern European Zone (NEZ) and Estonian Formula Renault championships. He competed in the Finnish Formula Ford championship alongside future Formula One drivers Mika Häkkinen and Mika Salo. However, despite finishing behind Salo and Häkkinen in the championship, Pertti"s career never went beyond Scandinavia, excluding a one-off appearance at Brands Hatch for the Formula Ford festival.
Krohn began his career in karts when he was six, he spent nine years karting before moving up into car racing in 2005 as a test driver for saloon cars.
In 2006, he competed in a number of Formula Ford events in his home country, finishing in eighth, and also competing in the Ford Ford Festival at Brands Hatch, finishing 10th, and also in the British Formula Ford Winter Series, finishing as runner up to Brit David Mayes. The Finn entered the full United Kingdom championship the following year as well as the Finnish Formula Three championship, "I was in a "97 Dallara with a H-pattern gearbox" Krohn recalls, "my shoulders were over the cockpit".
In the United Kingdom championship, Krohn finished the year in 17th with 82 points whilst he had a better time in Finnish Formula Three with six wins and finishing second overall in the championship. He also re-entered the Formula Ford festival as well, performing better than the previous year finishing eighth.
2008 was Krohn"s best year yet, with three championship wins in the Finnish, Northern European Zone (NEZ) and Estonian Formula Renault championships, recording ten wins in total.
He also competed in the British, Italian and Northern European championships as well, but experiencing little success by comparison. Krohn gained some notoriety during the year as well after climbing up from twenty–fifth to seventh in the wet conditions at Donington Park but soon dropped out of the point after his suspension failed and so had to complete the final three laps on three wheels, "exactly what January Magnussen would have done" commented Mark Burdett Motorsport engineer Andy Miller, who ran the Danish driver during his 1994 British Formula 3 campaign.
