Have you hesitated to plant expired seed? Don't. Hesitate, that is.
In early spring 2013, my frugal nature couldn't bear to toss out a previously opened package of zucchini seed packed for 2009. I planted one seed in each of twelve newspaper pots. Ten seeds germinated. The seedlings matured into beautifully lush plants that bore an abundance of zucchini throughout the growing season. The germination rate may vary with plant varieties, so recording results in a gardening journal would be helpful for future reference.