Yes assuming that you are otherwise qualified to make a traditional IRA, you can enter the contribution on your tax return as a deduction. As long as the contribution is made prior to the 4/17/18, you can claim the deduction.
Check the IRS link below for limits on IRA contributions if you or your spouse is covered by a retirement plan at work. Your deduction can be reduced/eliminated
Contribution
limits if you are covered by a retirement plan
Contribution
limits if you are not covered by a retirement plan but your spouse is
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