The Woodland Park Zoo is now offering 50 percent discounts on passes on select rainy days -- on a day like this, just check zoo.org/rainyday to see if it's being offered and download the coupon if it's up.
Here's what the zoo says about it:
Rainy Day Discounts are available on select days, depending upon weather forecasts and projected attendance. Discount coupons, when offered, are good for 50% off on all regular admissions to the zoo, limit four admissions per coupon. Discounts cannot be combined with other discounts or offers, and are good only for the day indicated on the coupon.
Unfortunately, there's no coupon offered today, but you can be assured there are lots of rainy days in our futures, so be patient.
My own tip is that even without a discount, the zoo is a great place to visit on a rainy day -- fewer crowds, still lots to see, and lots of rain hideaways, such as the tropical rainforest. Here's the zoo's handy guide to a "rainy day hop."