Anaconda not found in ZSh?

Since conda 4.4.0 (released 2017-12-20), the recommended way to add conda to your PATH has changed. Instead of the approach described in Jonathan's answer, this should be done using the conda.sh script in the etc/profile.d/ folder of your conda installation. After that you can activate the base environment. More information on why this is the case can be found in the conda changelog.

I needed to add the following lines to my .zshrc:

.  ~/miniconda3/etc/profile.d/conda.sh
conda activate base

This assumes that (mini)conda was installed with default parameters, i.e. into the home folder.

Altough I cannot test it on a Mac, (I have a Linux Zsh installed) this should work for you as well: Just execute

/(your conda installation path)/bin/conda init zsh

and restart your zsh shell. The init command will change your ~/.zshrc file accordingly, setting your PATH correctly and slightly change the PS1 (which is was most answers here do manually...).

I had a similar issue.

I checked in my .profile, .bashrc, and .bash_profile dot files in order to find any PATH information that I could copy over into my .zshrc file. Sure enough:

# added by Miniconda3 4.2.12 installer
export PATH="/Users/username/miniconda3/bin:$PATH"

After running source ~/.zshrc with those lines added, I could fire up my jupyter notebook server.