Aomori attraction

I plan to visit hirosaki aomori in the end of august.
May i know the season at that time? What is the best attraction at aomori at the end of august?
Is the rice field art available at the end of august?

May i know the season at that time?

Summer

What is the best attraction at aomori at the end of august?

Outdoor attractions such as Shirakami Sanchi, the Oirase Stream, Lake Towada and Hakkodasan should be nice around then:

http://www.japan-guide.com/e/e3775.html
http://www.japan-guide.com/e/e3776.html
http://www.japan-guide.com/e/e3790.html
http://www.japan-guide.com/e/e3780.html

Is the rice field art available at the end of august?

Yes, in fact that would be great timing to see the rice field art at Inakadate village.

If you're feeling adventurous, it would be a good time to go to Osorezan (it's somewhat far from Hirosaki, though).

http://www.japan-guide.com/community/mfedley/report-1102