Unlock ssh-agent keychain access prior to terminal opening?

With my SSL certificate passwords stored using ssh-agent I just need to provide a master passphrase to unlock the keychain in the terminal. Generally this isn't an issue, but when the computer restarts I am left typing in the passphrase into each terminal tab. This can be up to 10 tabs, which is fairly annoying. Is there any way to have the ssh-agent keychain unlocked prior to the terminal tabs opening, so I only need to type it once?