How do you plot a vertical line on a time series plot in Pandas?

plt.axvline(x_position)

It takes the standard plot formatting options (linestlye, color, ect)

(doc)

If you have a reference to your axes object:

ax.axvline(x, color='k', linestyle='--')

If you have a time-axis, and you have Pandas imported as pd, you can use:

ax.axvline(pd.to_datetime('2015-11-01'), color='r', linestyle='--', lw=2)

For multiple lines:

xposition = [pd.to_datetime('2010-01-01'), pd.to_datetime('2015-12-31')]
for xc in xposition:
    ax.axvline(x=xc, color='k', linestyle='-')

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