California State Route 33

View northeast from near Pine Mountain Summit on SR 33, the highest elevation on the route. The Lockwood Valley and Mount Pinos are in the distance.

SR 33 heading south through Kern County

A foggy winter day looking northbound south of Brown Material Road near Blackwells Corner.

State Route 33 begins in Ventura as a short freeway ("Ojai Freeway"). SR 33 then continues north as Maricopa Highway, an undivided surface road, through Ojai, following Matilija Canyon past the easternmost extremity of the Santa Ynez Mountains in Los Padres National Forest, and passing over the Transverse Ranges at Pine Mountain Summit. As SR 33 comes down into the Cuyama Valley, it comes up to a junction with SR 166 east of Cuyama. Route 33 continues with Route 166 as they enter Kern County for about 20 miles (32 km) to Maricopa where the routes separate. In Maricopa, Route 33 turns northwest, following the western side of the San Joaquin Valley. Between Taft and Avenal it roughly parallels Interstate 5 and the eastern foothills of the Temblor and Diablo ranges; for the first 15 miles (24 km) of the portion following the axis of the Midway-Sunset Oil Field. Northwest of Avenal, it turns due west to enter Coalinga, then turns northeast and soon becomes concurrent with I-5 for 13 miles (21 km). Thereafter, it departs due north near Cantua Creek, turns northwest at Mendota, through Firebaugh and meets State Route 152 in Dos Palos, in which it runs concurrently due west for approximately ten miles. It departs again west of Los Banos, turning north to Santa Nella (where it has an interchange with I-5), and roughly parallels I-5 and the San Joaquin River until its northern terminus at I-5 and Bird Road southeast of Tracy.

When passing through the Avenal/Coalinga area travelers pass near a series of prisons and government facilities. They include: Avenal State Prison, Pleasant Valley State Prison, and the Coalinga State Hospital.

In the portions of the route in Kern and Fresno Counties, SR 33 passes through one of the United States' largest petroleum extraction fields, with hundreds of nodding oil pumps along the highway. Some of the fields visible from the highway include the Midway-Sunset, South and North Belridge, Cymric, McKittrick, Lost Hills, and Coalinga oil fields.

Most of SR 33's route passes through sparsely populated, relatively desolate portions of the San Joaquin Valley. Travelers along it should use caution, since emergency services are typically dozens of miles away. Carrying extra water and coolant is especially advised, since summertime temperatures in the area routinely surpass 100 °F (38 °C).

Several segments of this route are part of the California Freeway and Expressway System,[2] but only two segments, one south of the northern city limits of Ojai, and one near SR 152 are part of the National Highway System,[3] a network of highways that are considered essential to the country's economy, defense, and mobility by the Federal Highway Administration.[4] Several segments are eligible to be included in the State Scenic Highway System;[5] however, only the portion from 6.4 miles north of the SR 150 junction to the Ventura–Santa Barbara county line is a scenic highway as designated by Caltrans,[6] meaning that it is a substantial section of highway passing through a "memorable landscape" with no "visual intrusions", where the potential designation has gained popular favor with the community.[7] This scenic segment is also designated as part of the Jacinto Reyes Scenic Byway, a National Forest Scenic Byway.[8]

Before the US 399 designation was deleted in 1964, SR 33 followed SR 166 east from US 99 at Wheeler Ridge to Maricopa in lieu of the segment from Ventura to Maricopa, and followed the old US highway from Taft to Maricopa. Today, SR 166 remains on the segment between Wheeler Ridge and Maricopa.

SR 33 used to extend north to Interstate 205 in Tracy, but this segment was relinquished after the segment of Interstate 5 from SR 33 to I-205 was completed.

When Caltrans implemented its exit numbering program in 2002, SR 33's section of the Ojai Freeway was not included and is one of the very few stretches of freeway in California to not feature exit numbers.

Except where prefixed with a letter, postmiles were measured on the road as it was in 1964, based on the alignment that existed at the time, and do not necessarily reflect current mileage. R reflects a realignment in the route since then, M indicates a second realignment, L refers to an overlap due to a correction or change, and T indicates postmiles classified as temporary (for a full list of prefixes, see California postmile § Official postmile definitions).[1] Segments that remain unconstructed or have been relinquished to local control may be omitted. The numbers reset at county lines; the start and end postmiles in each county are given in the county column. All exits are unnumbered.

County	Location	Postmile [1][9][10]	Destinations	Notes
Ventura VEN 0.00-57.51	Ventura	0.00	US 101 (Ventura Freeway, SR 1) – Los Angeles, San Francisco	Interchange; southbound exit and northbound entrance; south end of SR 33; US 101 exit 70B
		0.17	Main Street – Ventura	Interchange; southbound exit and northbound entrance
		1.57	Stanley Avenue	Interchange; southbound exit and entrance are on the left
	​	2.65	Shell Road	Interchange
	​	R4.49	Cañada Larga Road	Interchange
	​	R5.64	Casitas Vista Road	Interchange
	Casitas Springs		North end of freeway
	Mira Monte	11.21 R14.41[N 1]	SR 150 west (Baldwin Road) – Meiners Oaks, Lake Casitas, Carpinteria, Santa Barbara	South end of SR 150 overlap
	Ojai	16.58[N 1] 11.21	SR 150 east (Ojai Avenue) – Ojai, Santa Paula	North end of SR 150 overlap
	​	48.50	Lockwood Valley Road to I-5 – Lockwood Valley
Santa Barbara SB 0.00-8.18	No major junctions
San Luis Obispo SLO 0.00-4.95	​	2.80	SR 166 west – Cuyama, New Cuyama, Santa Maria	South end of SR 166 overlap
Kern KER 0.00-73.74	Maricopa	R11.56	SR 166 east (Poso Street) to I-5 south – Los Angeles	North end of SR 166 overlap
	Taft	17.89	SR 119 (Taft Highway)	Former US 399 north; western terminus of SR 119
	McKittrick	33.45	SR 58 west – California Valley, Santa Margarita	South end of SR 58 overlap
		34.29	SR 58 east to I-5 – Buttonwillow, Bakersfield	North end of SR 58 overlap; no left turn from SR 33 south to SR 58 east, access is via a left turn at Lokern Road
	Blackwells Corner	60.09	SR 46 – Lost Hills, Wasco, Bakersfield, Paso Robles	Former US 466
Kings KIN 0.00-18.99	​	7.80	SR 41 – Kettleman City, Fresno, Paso Robles
	Avenal	17.14	SR 269 (Skyline Boulevard) to I-5 – Huron, Lemoore NAS	Southern terminus of SR 269
Fresno FRE 0.00-R83.05	​	10.50	Jayne Avenue to I-5 – Stratford
	Coalinga	15.37	Polk Street to SR 198 west – King City
		15.71	SR 198 west (Elm Avenue) / Coalinga Plaza (Fifth Street) – King City	South end of SR 198 overlap
	​	24.32	SR 198 east (Dorris Avenue) / Shell Road – Lemoore, Hanford	North end of SR 198 overlap
	​	R29.02 17.96[N 2]	I-5 south (West Side Freeway) / SR 145 north (Fresno-Coalinga Road) – Los Angeles, Kerman	Interchange; south end of I-5 overlap; I-5 exit 337; southern terminus of SR 145
	​		South end of freeway on I-5
	​		North end of freeway on I-5
	​	29.96[N 2] R39.82	I-5 north (West Side Freeway) / Derrick Avenue – San Francisco, Sacramento	Interchange; north end of I-5 overlap; I-5 exit 349
	Mendota	59.43	California Avenue, Panoche Road to SR 180 east – Fresno
		61.45	CR J1 (Belmont Avenue)
		62.25	SR 180 east (Oller Street) – Fresno	Western terminus of SR 180
	Firebaugh	70.19	12th Street to I-5 north
Merced MER R0.00-30.00	Dos Palos Y	R5.64 R32.37[N 3]	SR 152 east / Elgin Avenue – Merced	Interchange; south end of SR 152 overlap
	Los Banos	21.27[N 3]	SR 165 (Mercey Springs Road) to I-5 south – Turlock
	​	13.85[N 3]	I-5 (West Side Freeway) – San Francisco, Sacramento, Los Angeles	Interchange; I-5 exits 403A-B
	​	11.27[N 3] R13.24	SR 152 west / San Luis Drive (to Gonzaga Road) – Gilroy	Interchange; north end of SR 152 overlap; SR 152 exit 60
	Santa Nella	R16.64	I-5 (West Side Freeway) – San Francisco, Sacramento, Los Angeles	Interchange; I-5 exit 407
	Gustine	26.46 4.35[N 4]	SR 140 west (Sullivan Road) to I-5	South end of SR 140 overlap
		6.06[N 4] 27.11	SR 140 east / First Avenue – Merced	North end of SR 140 overlap
Stanislaus STA 0.00-27.09	Newman	2.06	CR J18 (Stuhr Road) to I-5 – Livingston, Turlock
	Crows Landing	6.84	Crows Landing Road, Fink Road to I-5
	Patterson	12.57	CR J17 west (Sperry Avenue) to I-5	South end of CR J17 overlap
		13.18	CR J17 east (Las Palmas Avenue) – Turlock	North end of CR J17 overlap
	Westley	19.55	CR J16 (Grayson Road, Howard Road) to I-5
San Joaquin SJ 0.00-5.00	Vernalis	0.82	SR 132 / Vernalis Road – Modesto, San Francisco	Interchange
	​	4.83	I-5 (West Side Freeway) – Stockton, Sacramento, Los Angeles	Interchange; north end of SR 33; I-5 exit 452
	​	5.00	Ahern Road – Tracy	Continuation beyond I-5; former SR 33 north
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus       Incomplete access

•  California Roads portal

• King, Peter H. (July 7, 2008). "A workaday road that cuts through the state's back story: Two-lane Highway 33 isn't a fabled route, but it's rugged and real". Los Angeles Times: A1, A8..

Wikimedia Commons has media related to California State Route 33.

• Caltrans: State Route 33 highway conditions
• Caltrans Traffic Conditions Map
• California Highway Patrol Traffic Incidents
• California @ AARoads.com - State Route 33
• California Highways: SR 33