Look over the canes of your yellow raspberry plants starting in early summer to inspect them for clusters of immature fruits. The fruits will follow flowering and appear small, about the size of a pencil eraser -- green and compact.
Check the canes every two weeks to note the process of the growing fruits as they enlarge to the size of a penny, become soft in texture and turn to a golden yellow.
Pinch a yellow raspberry between your fingers with one hand and hold the container underneath the raspberry with the other. Gently tug the fruit away from the cane, without squeezing, and drop it into the container. Repeat this step to collect other ripe raspberries.
Avoid squeezing or pulling the raspberries with force, as you can break apart or squish the ripened fruit. If the fruit resists releasing from the cane when tugged, then leave it to fully ripen for another week or two.
Collect raspberries every one to two weeks as they ripen throughout the growing season. Yellow raspberry varieties are everbearing, meaning they will continue to flower and set fruit for the length of the growing season rather than producing and ripening berries all at once.