Should I open an traditional Roth IRA account?
Besides the income limit you also have to keep in mind that the IRS doesn't care that you decided not to participate in the 410K, it was offered therefore they consider that yo are covered by a retirement plan at work.
Regarding a Traditional IRA:
- Assuming you are single a traditional IRA is fully deductible if your Modified AGI is $60K or less.
- more than $60,000 but less than $70,000 a partial deduction.
- $70,000 or more no deduction.
There are limits for the Roth IRA but they are not based on if you have a 401K at work.
By missing the open season you are also missing out on any company match. I have only heard of 401K open seasons for very small companies. Verify that there is no other possibility.
Also ask if having a life event (baby, marriage, change in employment by spouse) will allow you to join in the middle of the plan year. Joining a 401K isn't a good reason to trigger one of the event, but if it does apply you wouldn't want to miss another chance.
would I be able to move it to my employers 401k account next year?
The plan decides what type of rollovers they allow into the plan. You have to see what they allow. Most people aren't interested in rolling IRA money into a 401K, because you generally have at most a dozen investment choices in the 401K, but have thousands of choices in the IRA. Also the matching is gone, so you don't get it back by rolling money into the 401K.