from multiprocessing.pool import Pool
import pandas as pd
from matplotlib import pyplot as plt

def func(df):
    fig, ax = plt.subplots()
    df.plot(ax=ax)
    return 'title', fig

if __name__ == '__main__':
    index = pd.DatetimeIndex(pd.date_range('2016-10-05', periods=10, freq='T', tz='UTC'))
    index = index.tz_convert('America/Chicago')
    df = pd.DataFrame(list(range(10)), index=index, columns=['a'])
    with Pool(3) as pool:
        proc = pool.apply_async(func, (df,))
        title, fig = proc.get()
        fig.savefig(r'.\test.png')

Traceback (most recent call last):
  File "C:\miniconda\envs\p3\lib\threading.py", line 914, in _bootstrap_inner
    self.run()
  File "C:\miniconda\envs\p3\lib\threading.py", line 862, in run
    self._target(*self._args, **self._kwargs)
  File "C:\miniconda\envs\p3\lib\multiprocessing\pool.py", line 429, in _handle_results
    task = get()
  File "C:\miniconda\envs\p3\lib\multiprocessing\connection.py", line 251, in recv
    return ForkingPickler.loads(buf.getbuffer())
  File "C:\miniconda\envs\p3\lib\site-packages\matplotlib\dates.py", line 730, in __getattr__
    return getattr(self._rrule, name)

  ...

  File "C:\miniconda\envs\p3\lib\site-packages\matplotlib\dates.py", line 730, in __getattr__
    return getattr(self._rrule, name)
RecursionError: maximum recursion depth exceeded