Crews from Bolsover and Shirebrook battled to douse flames at the New Station Road site for three hours after being called out around 3am on Thursday.
Pictures show balls of fire and billows of smoke coming from the wooden structures and the burned remains of the aftermath.
Firefighters described “various sheds and materials well alight” as they fought “through the night”.
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Today a Derbyshire Fire and Rescue spokesperson said fire investigation had found Thursday’s blaze was a “deliberate ignition”.
She added: “We were called at 3.08am on March 31 to attend a large shed fire on an allotment on New Station Road in Bolsover.
“On arrival fire crews found a fire involving approximately four large garden sheds, using two hose reel jets to extinguish the fire.
“A fire investigation into the cause of the fire has determined that it was a deliberate ignition.”