Place the watermelon chunks into the blender.
Add the lime juice and salt to the blender with the watermelon.
Secure the lid on the blender and blend on high speed until the mixture is smooth and completely pureed, about 30-45 seconds. Look for a vibrant red liquid with no large chunks.
Pour the blended mixture evenly into ice pop molds, filling each to about ¾ full.
Insert the sticks into the molds and freeze uncovered for at least 4 hours, or until fully solidified. The pops should be firm and ice-cold when ready.
To serve, run warm water briefly over the outside of the molds to loosen the pops, then carefully remove and enjoy immediately.