Approximately how long does the aquatic tadpole stage of the Wood Frog usually last before metamorphosis?

Between 6 to 10 weeks.

The tadpole stage of the wood frog is entirely dependent on the finite water supply within the vernal pool. After hatching relatively quickly, generally within one to three weeks of fertilization, the small, dark-colored tadpoles must feed on algae and decaying matter. Because their habitat is ephemeral, their developmental timeline is strictly constrained. The entire period from hatching until metamorphosis—the transformation into a terrestrial froglet—typically spans between 6 to 10 weeks. This time frame is accelerated partly because the dark coloration helps absorb solar radiation in the shallow water, providing necessary warmth to speed development before the pool completely dries up, which would otherwise result in total reproductive failure for that breeding event.