[trisham]

"The native range lies roughly south of a line from southeastern Nebraska through southern Iowa, Illinois, and Indiana to southwestern Ohio. In the southern states, it is native from central Texas to western Georgia and north to Kentucky.

Despite rumors to the contrary, the brown recluse spider has not established itself in California nor anywhere outside its native range. Over the last century, occasional spiders have been intercepted in various states where they have no known established populations; these spiders may be transported fairly easily, though the lack of established populations well outside the natural range also indicates that such movement has not led to colonization of new areas, after decades of opportunities.
Note that the occurrence of brown recluses in a single building (such as a warehouse) outside of the native range is not considered a successful colonization; such single-building populations can occur (e.g., several such cases in Florida, but do not spread, and can be easily eradicated."

Source: Wikipedia

[SWAMPSNIPER]

They hitch rides in packing crates and luggage and can show up way beyond their natural range.

[RandallFlagg]

"The native range lies roughly south of a line from southeastern Nebraska through southern Iowa, Illinois, and Indiana to southwestern Ohio. In the southern states, it is native from central Texas to western Georgia and north to Kentucky.

I'll be staying in Colorado forever now, thank you...
*shutter*