When are nectarines too ripe to eat?

Nectarines are too ripe to eat when they become overly soft to the touch, have a dull skin appearance, or develop dark spots or wrinkles. Additionally, if they emit a strong fermented smell, it's a sign that they may be spoiled. Ideally, they should be slightly firm with a sweet aroma for optimal freshness and flavor. It's best to consume them when they are ripe but still have some firmness.