While fresh broccoli is generally preferred for roasting, you can still use frozen broccoli if you don't have fresh broccoli on hand. However, there are a few things to keep in mind when using frozen broccoli for roasting: Thaw the broccoli: Before roasting, thoroughly thaw the frozen broccoli and pat it dry with a paper towel. This will help remove excess moisture and ensure the broccoli roasts evenly. Adjust the roasting time: Frozen broccoli may take longer to roast than fresh broccoli, as it contains more moisture. Start by roasting the broccoli for 10-15 minutes and check it frequently until it is tender and slightly browned. Remember that frozen broccoli's texture and flavor may not be as good as fresh broccoli. However, it can still be a convenient and tasty option when fresh broccoli is not available.