2017-18 season ratings

Network season ratings chronology
Previous: 2016-17 Next: 2018-19

Below is a list of ratings for the series broadcast on The CW during the 2017-18 season.

Overview

• New series are listed in bold.

Series	Time slot	Original run		Viewers average (millions)	Rating average (18–49)
		First aired	Last aired
The 100	Tuesdays 9/8c	April 24, 2018	August 7, 2018	0.96	0.30
	Tuesdays 8/7c
Arrow	Thursdays 9/8c	October 12, 2017	May 17, 2018	1.27	0.43
Black Lightning	Tuesdays 9/8c	January 16, 2018	April 17, 2018	1.73	0.56
Burden of Truth	Wednesdays 8/7c	July 25, 2018	October 3, 2018	0.72	0.14
Crazy Ex-Girlfriend	Fridays 8/7c	October 13, 2017	February 16, 2018	0.63	0.20
DC's Legends of Tomorrow	Tuesdays 9/8c	October 10, 2017	April 9, 2018	1.50	0.48
	Mondays 8/7c
Dynasty	Wednesdays 9/8c	October 11, 2017	May 11, 2018	0.69	0.19
	Fridays 8/7c
The Flash	Tuesdays 8/7c	October 10, 2017	May 22, 2018	2.22	0.79
iZombie	Mondays 9/8c	February 26, 2018	May 28, 2018	0.76	0.24
Jane the Virgin	Fridays 9/8c	October 13, 2017	April 20, 2018	0.63	0.24
Life Sentence	Wednesdays 9/8c	March 7, 2018	June 15, 2018	0.44	0.13
	Fridays 9/8c
Masters of Illusion	Fridays 8/7c	June 29, 2018	October 5, 2018	0.89	0.19
My Last Days	Fridays 8/7c	May 25, 2018	June 8, 2018	0.55	0.10
The Originals	Wednesdays 9/8c	April 18, 2018	August 1, 2018	0.83	0.31
The Outpost	Tuesdays 9/8c	July 10, 2018	October 2, 2018	0.63	0.15
Penn & Teller: Fool Us	Mondays 8/7c	April 2, 2018	October 1, 2018	1.31	0.31
Riverdale	Wednesdays 8/7c	October 11, 2017	May 16, 2018	1.37	0.49
Supergirl	Mondays 8/7c	October 9, 2017	June 18, 2018	1.84	0.51
Supernatural	Thursdays 8/7c	October 12, 2017	May 17, 2018	1.69	0.56
Valor	Mondays 9/8c	October 9, 2017	January 29, 2018	0.96	0.22
Whose Line Is It Anyway?	Mondays 9/8c	June 4, 2018	October 1, 2018	1.04	0.29

The 100

Encore episode ratings

Episode	Air date	Rating (18-49)	Viewers (millions)	Viewership difference
5x01	May 29, 2018	0.1	0.55	N/A
5x02	June 12, 2018		0.46	↓0.09

The Flash

Encore episode ratings

Episode	Air date	Rating (18-49)	Viewers (millions)	Viewership difference
4x06	December 26, 2017	0.2	0.79	N/A
4x07	January 2, 2018		0.84	↑0.05
4x08	January 9, 2018		0.81	↓0.03
4x09	February 13, 2018	0.3	1.06	↑0.25
4x10	February 20, 2018	0.2	0.87	↓0.19
4x14	March 20, 2018		0.94	↑0.07
4x15	March 27, 2018		0.80	↓0.14
4x16	April 3, 2018		0.91	↑0.11
4x01	May 29, 2018		0.70	↓0.21
4x02	June 5, 2018		0.75	↑0.05
4x03	June 12, 2018		0.59	↓0.16
4x04	June 19, 2018		0.66	↑0.07
4x05	June 26, 2018		0.60	↓0.06
4x16	August 14, 2018	0.1	0.60	0.00
4x17	August 21, 2018	0.2	0.58	↓0.02
4x18	August 28, 2018		0.68	↑0.10
4x19	September 4, 2018	0.1	0.48	↓0.20
4x20	September 11, 2018	0.2	0.61	↑0.13
4x08	September 18, 2018		0.59	↓0.02
4x22	September 25, 2018		0.56	↓0.03
4x23	October 2, 2018	0.1	0.52	↓0.04

Supergirl

Encore episode ratings

Episode	Air date	Rating (18-49)	Viewers (millions)	Viewership difference
3x07	January 1, 2018	0.2	0.78	N/A
3x08	January 8, 2018		1.03	↑0.25
3x19	May 23, 2018		0.63	↓0.40
3x20	May 30, 2018		0.75	↑0.12
3x21	June 6, 2018		0.74	↓0.01
3x22	June 13, 2018		0.59	↓0.15
3x23	June 20, 2018		0.60	↑0.01
3x01	June 27, 2018	0.1	0.77	↑0.17
3x02	August 8, 2018		0.50	↓0.27
3x03	August 15, 2018		0.43	↓0.07
3x04	August 22, 2018		0.50	↑0.07
3x05	August 29, 2018		0.51	↑0.01
3x07	September 12, 2018		0.54	↑0.03
3x08	September 17, 2018	0.2	0.76	↑0.22
3x09	September 19, 2018	0.1	0.42	↓0.34
3x10	September 26, 2018		0.52	↑0.10
3x23	October 3, 2018		0.42	↓0.10