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Most pinto beans will reach this stage between 90 and 150 days.  Bush beans mature at once, giving you a single harvest. Pole beans yield several harvests and should be picked regularly so that more beans can grow. Note that mature beans can barely be dented when bitten. If the weather starts getting damp before the seeds fully dry, pull the entire plant after most of the foliage has already died and hang it by its roots in a well-ventilated, dry location. The bean pods can finish drying this way. You can shell pinto bean pods individually by hand or in batches.  To shell the beans in batches, place the pods in an old pillowcase and walk on it for a minute or so, crushing the pods open. You can remove the chaff by pouring the beans back and forth between two containers or by letting them sit out in a breezy area. Place the beans in a freezer-safe container and let them sit in your freezer for several hours before transferring them to long-term storage. This added step can help prevent problems with weevils and similar pests. Place the shelled, cool beans in airtight jars and store them in a dry, cool place, like a pantry or cellar. Dried pinto beans will usually last at least one year if stored properly but may last even longer.
Wait until the beans dry out. Shell the pods. Freeze the beans temporarily. Store the beans in a cool location.