Yes, spice racks should generally be kept away from dishwashers due to the heat and moisture, which can degrade the spices and damage the rack itself.
The heat and humidity generated by a dishwasher can significantly impact the quality of your spices. Exposure to these conditions can cause spices to lose their flavor and aroma more quickly. The moisture can also lead to clumping or even mold growth within the spice containers. Furthermore, if your spice rack is made of wood or certain metals, the repeated exposure to heat and moisture can cause warping, rusting, or other forms of damage. Keeping your spice rack away from the dishwasher helps preserve the freshness and potency of your spices and extends the life of your spice rack. Consider storing your spices in a cool, dry place away from direct sunlight and heat sources.
To maximize the shelf life of your spices, store them in airtight containers made of glass or metal, and label them with the date of purchase. This will help you keep track of their freshness and avoid using expired spices.