When should I take up my amaryllis bulbs? They have bloomed.

I wait for the greenery to mostly die off, then remove the bulb and store in a dark place until the beginning of next winter.

before that can be answered are you in a location with a danger of frost

The secret to keeping amaryllis thriving for years is to keep the plants actively growing AFTER they have finished blooming.

After the flowers have faded, cut them off to prevent seed formation. Seed formation will deplete important energy reserves in the bulb and reduce blooming.

Do not remove the flower stalk until it has turned yellow, A green stem will continue to promote photosynthesis which creates energy that is stored in the bulb for future leaf growth and flowers.

If the bulb does not produce a flowering stalk the next blooming period, it is likely that has not stored enough nutrients during the post-blooming period. Keeping the plant healthy and growing will promote blooming.

After your plant has finished blooming, place it in the sunniest possible location indoors. It will continue to grow long, smooth leaves. These leaves will promote photosynthesis.

Continue to water and fertilize the plant regularly with an all-purpose houseplant plant fertilizer.

Here's everything you need to know about amaryllis:

https://www.extension.umn.edu/garden/yard-garden/flowers/growing-and-caring-for-amaryllis/