Ya, you would think a proper launch with a dock etc, could get away with lower tides, but I dunno. I know Pacific Playgrounds is pretty sketchy at lower tides also, but not sure what the lowest tide possible would be.
I went to launch at Kitty. (I was having a dumb day). Was about an hour before low tide, somewhere around a 0.4. Figured, "I bet I can still manage to get off the trailer". Well, once I laid eyes on the ramp I quickly realized that launching would have been impossible without a tank or something. At the end of the ramp, there was about 10-15' of seaweed covered rock, followed by around 20' of sand - just to get to the water - and even if you were dumb enough to try, the water was very shallow for a ways out past that.
So I called Salmon Point and Pacific Playgrounds from the Kitty launch. Salmon said no go (as I noted earlier) and Pacific said "maybe, but doubtful". I told her I have a draft of around 20" (I believe it is a little less actually). She said it might be possible, but not with any confidence. So they had water, but extremely shallow in the channel. So I just said F-it and drove back into Comox and launched there.
The Comox Launch was right at low tide (0.2m). The water was a few inches past the end of the ramp. End of the ramp was a big drop, maybe 10", and then the sand/mud sloped down at maybe a 45 degree angle. I figured, lets do it.
Slowly backed the trailer tires over the edge, got the boat in the water with zero problems. When I went to pull the empty trailer over the ledge, truck was in 4x4 and all 4 tires slipped a little, but got it over. Would not recommend retrieving a boat at that tide though!!!