Check out this Animal Crossing: New Horizons Switch (ACNH) guide to learn how to get Tarantula. Guide includes location, where to find, what time and which season does it appear.Check Out Bug List (Critterpedia) From Here
How To Catch Tarantula
Tarantulas Only Appear At Night
Tarantulas only appear at night (7pm to 4am). Wait until it gets dark to go hunting for these creepy crawlies!Check Out The How To Change Time!
Tarantulas Appear During Certain Months
Tarantulas only appear in January, February, March, April, November, and December. Perhaps Tarantulas are averse to hot weather?
Stop When It Strikes A Threatening Pose
When catching a Tarantula, sneak up on it by pressing and holding the "A" button. When the Tarantula raises its legs and starts trying to intimidate you, don't move and wait until it stops its pose. Get close enough and catch with your net.
Visit Tarantula Island!
Though it sounds terrifying, there is an island in-game you can visit which is filled with Tarantulas. You can catch as many as you can hold here, so make sure to go on a Mystery Island Tour to find this Island!Check Out Tarantula Island Here!
What's The Price Of A Tarantula?
You can sell Tarantulas for 8,000 Bells each. This is a very efficient way to earn bells so catch as many Tarantulas as possible to pay back your loans.Learn Other Ways To Earn Money (Bells) Fast