Get a quote for the fund you want on the M* website.

On the left side of the page, click on TOTAL RETURN.

On the top of the page you will see 3 tabs, click on QUOTES.

For every mutual fund I went to, on this page, I found the 52-week high and 52-week low to be N/A.  Not very informative, hugh?

That information isn't as useful for mutual funds as for stocks, because of the way dividends are paid.  You may have to ask M* if the loss of data is permanent.  It is still available for stocks.

erryl