+1...If you want after the starter is done (24hr or so ) you can put it in with your wort and let them equilibrate over night to 50ºF and pitch in the morning, this way you don't shock the little monkeys!Room temperature.
You're making a starter with dry yeast? I guess that's worth doing if you're somehow stuck with one packet.
To answer your question... room temp is OK if you planned ahead timewise to crash cool and decant the spent starter beer, ~50°F for if you didn't and plan to pitch the whole starter.
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