Pour peroxide down the hole right away if you haven't done that already.

I poured a little peroxide down in it. I wasn't sure how much so I only used a little. I noticed it started bubbling. What does the peroxide do? I've never heard of using it on a plant. Will the tree eventually recover?

It sounds like the damage is from excessive wetness combined with low temperatures. I'm assuming you have it planted in the ground (??). The damage may have been in the winter or current Spring if it's been rainy (and your soil not too well-draining). Yes, it can recuperate but it may take a while and it definitely will set any and all growth back for a season. Frankly, I would pot it up and grow it as a containerized plant (protected from cold and wet) until it recuperates fully. (Peroxides is to protect it from spread of fungi.) I once had a Washingtonia suffer bud loss in the SUMMER due to excessive rains--it eventually re budded without any distortion of appearance. Good luck!

Thanks nj. We had a really wet winter and spring and the damage must have occurred when I took the boxes off in early Feb. It is in the ground by my patio. It's twin is doing really good and has produced 5-6 new fronds in the last month and a half. I guess this one just got too wet.