The 'Beat Again' boyband have been told to stay outside a "five-mile radius" away from arenas used for their '4th Dimension' jaunt by their insurers.
The group's last tour had a number of incidents involving fans, who caused thousands of pounds worth of damage, including letting off fire extinguishers and finding their way onto the tour bus.
Security costs for the new shows are said to have been too high if JLS were to stay in city centres.
"The boys are used to being chased around by screaming teenage girls, but when it came to booking hotels for the tour, security costs would have doubled to prevent similar occurrences to last year," a source told The Mirror.
"One girl broke onto their bus with 'Happy Birthday Oritse!' written on her naked torso and another climbed over Aston's balcony into his bedroom. It was decided security needed to be stepped up a gear to ensure the boys remain safe."
The source added: "If fans knew they were staying out of town, the insurance were happier to fork out on potential mishaps if their location was found out.
"Every security breach costs an arm and a leg in drafting in more support and repairing any damage. The last bill was astronomical."
The 26-date tour begins tonight (March 14) at Liverpool's Echo Arena.
> JLS behind the scenes on Team GB London 2012 promo - watch video
Watch the video for 'Take a Chance on Me' by JLS below: