is this your firt season? are they darker thhen last year? haas are small and range in color from mild green to almost black with some brownish. go to google images type in haas avocados see if yours looks like the diffrent range of colors that will pop up

Most of them are green right now. A few are starting to turn very dark (basically black) at the bottom.

Last year there were very few avocados. I picked them while they were still green. I don't know if they would have started to turn black if I had left them on the tree, and unfortunately, I don't remember exactly when I picked them, either.

Based on googling, the color and shape is consistent with Hass avocados, but I am wondering about the progression of the color change, from the bottom up toward the stem. Does that sound normal? I didn't see anything about the progression of the change in the sources I googled.

--McKenzie

there is a chart on this page that may help you
http://www.avocadocentral.com/how-to/how-to-pick-how-to-buy-avocados