This form of tenancy has become more or less obsolete, but I am not aware of any reason why it would not be recognized in Colorado. It is similar to joint tenancy by right of survivorship, which is generally used by marital couples. You may nonetheless wish to consult an attorney, particularly if this pertains to a child support obligation.
This response is not intended to create an attorney/client relationship between any individuals, and is not intended as specific legal advice.
No. They are not recognized in CO anymore.
The information provided in this answer does not create an attorney-client relationship and is not considered to be legal advice.
See prior answers.
In no way am I offering you legal advice, and in no way has my comment created an attorney-client relationship. You are not to rely upon my note above in any way, but insted need to sit down with counsel and share all relevant facts before receiving fully-informed legal advice. If you want to be completely sure of your rights, you must sit down with an experienced criminal defense attorney to be fully aware of your rights.
The answer to your specific question is that Tenancy by the Entirety deeds are only authorized in a few states that have enabling provisions in their statutes. A more general observation is that any attempt to shelter your husband's assets after a judgment is entered can cause you to run afoul of the fraudulent conveyance laws and you should proceed only after meeting with a qualified attorney.