Preheat oven to 250°F. Line a large rimmed baking sheet with parchment paper.
In a large bowl, stir together 3 cups rolled oats, 1 ½ cups pecan halves, 1 cup shredded or flaked unsweetened coconut, 1 ½ teaspoons ground cinnamon, ½ teaspoon fine salt, and ¼ cup light brown sugar until evenly combined.
If solid, melt ¼ cup coconut oil, then in a medium bowl whisk together the ¼ cup melted coconut oil and ¼ cup honey until smooth.
Pour the honey–coconut oil mixture over the oat mixture and stir thoroughly so the dry ingredients are evenly coated.
Spread the coated granola in an even layer on the prepared baking sheet (about ¼–½ inch thick). Press lightly if you want larger clusters.
Bake at 250°F for 60–75 minutes, stirring and scraping the granola from the edges and turning the pan every 20 minutes (about 3–4 stirs total) to promote even browning.
Remove the pan from the oven and let the granola cool completely on the baking sheet (do not add blueberries while warm).
Once completely cool, add 1 cup dried blueberries and toss gently to combine.
Store the granola at room temperature in an airtight container.