Best assumption, Gulf Fritillary Caterpillar ( _Agraulis vanillae_ ). I could be wrong though.
> The larva is a caterpillar which grows to approximately 4 cm (1.6 in) in length. It is bright orange in color and covered in rows of black spines. The spines are soft to the touch and do not sting, but the larva is poisonous if eaten. Source: Wikipedia.