Fire hazard zones for vacant land in Altadena

Of the 5,334 vacant lots in Altadena, 1,169 (22%) are in a CAL FIRE Very High fire hazard severity zone, 517 are High and 498 are Moderate. 3,150 are outside any zone. In High and Very High zones, sellers of property with buildings must show a defensible space inspection, and new homes must meet California's wildfire building standards.

Fire hazard zones in Altadena

CAL FIRE zone	Vacant lots	Share
Very High	1,169	22%
High	517	10%
Moderate	498	9%
Not in a zone	3,150	59%

What the zones mean for buyers: fire hazard zones explained.

Lots in a High or Very High fire zone in Altadena

Lowest assessed value first (25 of 1,686).

Lot	Acres	Assessed	Zone
3075 Calanda Ave5829-016-058	0.03	$9	High
318 W Palm St5832-009-004	0.15	$7,612	High
326 W Palm St5832-009-005	0.15	$7,612	High
3381 Glenrose Ave5832-002-029	0.18	$7,777	Very High
152 E Loma Alta Dr5833-002-024	0.15	$7,792	High
152 E Loma Alta Dr5833-002-021	0.14	$7,792	High
149 Reever Way5832-023-002	0.13	$7,939	High
3133 Hermar Ct5832-007-009	0.16	$8,107	High
3041 Calanda Ave5829-016-017	0.2	$8,592	High
3191 Grandeur Ave5832-008-024	0.18	$8,592	High
3217 Olive Ave5829-010-003	0.17	$8,592	Very High
3184 Grandeur Ave5832-007-020	0.17	$8,592	High
3316 Dabney Ave5829-007-018	0.15	$8,592	Very High
110 Reever Way5832-022-007	0.13	$8,592	High
474 W Loma Alta Dr5829-009-029	0.26	$8,918	Very High
400 W Marigold St5829-011-011	0.18	$8,918	Very High
450 W Marigold St5829-011-017	0.18	$8,918	Very High
443 W Palm St5829-011-021	0.18	$8,918	Very High
394 W Marigold St5829-011-010	0.17	$8,918	Very High
410 W Marigold St5829-011-012	0.17	$8,918	Very High
427 W Altadena Dr5829-015-014	0.17	$8,918	High
3200 Santa Anita Ave5841-001-001	0.15	$8,918	High
3226 Santa Anita Ave5841-001-005	0.15	$8,918	High
426 W Palm St5829-014-022	0.18	$9,242	High
443 W Pentagon St5829-014-025	0.18	$9,242	High

Lots outside fire hazard zones in Altadena

Lowest assessed value first (25 of 3,150).

Lot	Acres	Assessed
604 E Las Flores Dr5841-013-030	0.12	$1,303
772 E Mariposa St Unit B5840-014-083	2.4	$2,729
772 E Mariposa St Unit C5840-014-084	2.4	$2,729
776 E Mariposa St Unit B5840-014-086	2.4	$2,729
776 E Mariposa St Unit A5840-014-087	2.4	$2,729
760 E Mariposa St No C5840-014-044	2.4	$2,734
760 E Mariposa St No C5840-014-045	2.4	$2,734
760 E Mariposa St No D5840-014-046	2.4	$2,734
770 E Mariposa St No A5840-014-047	2.4	$2,734
770 E Mariposa St No B5840-014-048	2.4	$2,734
770 E Mariposa St No C5840-014-049	2.4	$2,734
770 E Mariposa St No D5840-014-050	2.4	$2,734
770 E Mariposa St No E5840-014-051	2.4	$2,734
770 E Mariposa St No F5840-014-052	2.4	$2,734
770 E Mariposa St No G5840-014-053	2.4	$2,734
770 E Mariposa St No H5840-014-054	2.4	$2,734
782 E Mariposa St No A5840-014-055	2.4	$2,734
782 E Mariposa St No D5840-014-058	2.4	$2,734
778 E Mariposa St No A5840-014-059	2.4	$2,734
778 E Mariposa St No B5840-014-060	2.4	$2,734
778 E Mariposa St No C5840-014-061	2.4	$2,734
778 E Mariposa St Unit D5840-014-062	2.4	$2,734
774 E Mariposa St No D5840-014-063	2.4	$2,734
774 E Mariposa St No C5840-014-064	2.4	$2,734
774 E Mariposa St No B5840-014-065	2.4	$2,734

Questions about land in Altadena

Is Altadena in a fire hazard severity zone?

2,184 of 5,334 vacant lots in Altadena are in a CAL FIRE fire hazard severity zone: 1,169 Very High, 517 High and 498 Moderate. 3,150 are outside any zone.

What does a Very High fire zone mean for land in Altadena?

The seller must disclose it, owners must keep defensible space cleared around buildings, and a new home must meet California's wildfire building standards (Building Code Chapter 7A). Get insurance quotes before you buy.

More for Altadena: all vacant land · flood zones

Sources

Counts are LandGrab's analysis of 2026 public data for vacant parcels in Los Angeles County, updated 2026-10-21. Maps change; confirm a specific lot with the county before you buy.