The higher elevations and Northern regions of the West often have cold soil well into the early part of June. The most common cause of germination failure is planting too soon. Sow every two weeks for a continuous harvest so you will have enough beans for fresh eating and freezing.
Beans are susceptible to many diseases including bacterial and fungal wilts.
Mexican bean beetles are devastating and are easy to spot for they are small round very fuzzy bright yellow bugs, and along with aphids, can be controlled by using organic sprays such as Rotenone or Pyrethrum. Do not spray when windy or when honey bees are at work on the crops. Wait until late evening when bees have gone to bed before spraying. Pediobius wasps and the spined soldier bug are natural predators. Mealybugs can also cause bean plants to suddenly wilt so look for tiny white, woolly scale-like creatures and spray with the above organic sprays.