On its age, its old homes and the National Register, Temescal Valley is more historic than 9% of U.S. towns, #696 of 847 in California. Its National Register listings hold the grade up; its share of homes from before 1940 pulls it down.
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HistoryA character grade: shown, never part of Temescal Valley’s overall grade.
Few California towns list much on the Register (a typical California town has 0.0 per 10,000 residents, the U.S. 2.4), so Temescal Valley’s 0.0 sits below most of its state (31% of California towns have fewer) while its 0 listings outnumber those of 23% of U.S. towns.
How sure. Graded on two of the three inputs, so a change in either one moves the letter more than it would with three. The pre-1940 share (±0.9 points) is firm at this size.
Founding year: our sources. Homes: Census ACS 2020–24. National Register: National Park Service, May 2026 list; each listing counted once (boundary changes and added documentation belong to their listing), and a historic district counts its contributing buildings. How TownRatings grades history →
What stands out about Temescal Valley’s past
Read from the archive, the National Register and the record. The page puts what stands out first.
Temescal Valley takes its name from the Rancho Temescal established by Leandro Serrano. Serrano received the written permission of the priest of the Mission San Luis Rey de Francia, or of the military commander of San Diego, to occupy the five square league Rancho Temescal on land belonging to Mission of San Luis Rey. He took possession in about 1818 or 1819 under a grant given by Governor José María de Echeandía to Leandro Serrano. The Serrano Boulder (California Historical Landmark (#185), marks the site of the first house erected by Leandro Serrano about May 1824. The grant extended along the Temescal Valley south of present-day Corona and encompassed El Cerrito and Lee Lake. The Serrano family held the land until they lost the court case validating their title to the land in 1866. Meanwhile, squatters settled on the land in anticipation of this result in 1855.
Every edition of the U.S. Geological Survey’s map of Temescal Valley. Tap a year, or press play to watch the town change.
1953Lake Mathews sheet · 1:24,000
U.S. Geological Survey historical topographic maps (public domain), via Esri’s collection of the scans. The red ring marks the center of Temescal Valley.
Famous people
Famous people close to Temescal Valley
Nobody well known was born in Temescal Valley itself, so here are the best known from just nearby.
Temescal Valley is more historic than 9% of U.S. towns, #696 of 847 in California. The History grade combines the town’s founding era, the share of homes built before 1940 and its National Register listings. It’s a character grade, so it isn’t part of the overall grade. How it works.
How old are the homes in Temescal Valley?
0.7% of Temescal Valley’s homes were built before 1940 (Census estimate), against a typical 3.4% for a California town; the median home was built in 2003.
Founding dates: Wikidata, Wikipedia, the U.S. post office records of Blevins & Helbock (CC0) and the Census. Homes by year built: Census ACS 2020–24. National Register of Historic Places: National Park Service (list of May 22, 2026). Old photos, postcards and papers: Wikimedia Commons, the Library of Congress and other public archives, credited on each item’s page. Maps: U.S. Geological Survey historical topographic maps (via Esri) and Sanborn fire-insurance maps (Library of Congress). History text and census tables: Wikipedia (CC BY-SA 4.0). Places that used to be: USGS Geographic Names Information System (2021).
From Wikimedia Commons (2), Wikipedia, U.S. Geological Survey historical maps, the US Post Offices dataset (Blevins & Helbock) and the USGS Geographic Names Information System. Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.
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