Heat Island Mitigation: Palo Alto vs Sunnyvale
How do heat island mitigation rules compare between Palo Alto, CA and Sunnyvale, CA?
Palo Alto and Sunnyvale have similar restriction levels.
Palo Alto, CA
Santa Clara County
The OneSCC 2030 Sustainability Master Plan and county tree canopy goals guide heat island mitigation through cool roofs, cool pavement, urban forestry, and cooling-center activations when National Weather Service forecasts highs at or above 95 degrees Fahrenheit for two consecutive days in unincorporated areas.
View full Palo Alto rules →Sunnyvale, CA
Santa Clara County
The OneSCC 2030 Sustainability Master Plan and county tree canopy goals guide heat island mitigation through cool roofs, cool pavement, urban forestry, and cooling-center activations when National Weather Service forecasts highs at or above 95 degrees Fahrenheit for two consecutive days in unincorporated areas.
View full Sunnyvale rules →Key Facts Comparison
| Fact | Palo Alto | Sunnyvale |
|---|---|---|
| Activation threshold | 95F for 48 hours | 95F for 48 hours |
| Single-day threshold | 100F any single day | 100F any single day |
| Lead agency | Office of Emergency Management | Office of Emergency Management |
| Tree partner | Our City Forest, county Parks | Our City Forest, county Parks |
| Cooling sites | Libraries, senior, community centers | Libraries, senior, community centers |
Highlighted rows indicate differences between cities.
Palo Alto FAQ
Where is the nearest cooling center?
Call 211 Bay Area or check sccgov.org/emergency when a heat alert is active. Most county libraries, senior centers, and community rooms participate. Many offer extended evening hours during multi-day heat events with free water available.
Does the county pay for tree planting on my street?
Our City Forest partners with county Parks and cities on free street-tree plantings in equity zones, including delivery, hole-digging, and 3-year establishment care. Outside those zones, owners typically arrange and pay for parkway plantings themselves.
Sunnyvale FAQ
Where is the nearest cooling center?
Call 211 Bay Area or check sccgov.org/emergency when a heat alert is active. Most county libraries, senior centers, and community rooms participate. Many offer extended evening hours during multi-day heat events with free water available.
Does the county pay for tree planting on my street?
Our City Forest partners with county Parks and cities on free street-tree plantings in equity zones, including delivery, hole-digging, and 3-year establishment care. Outside those zones, owners typically arrange and pay for parkway plantings themselves.
Compare other topics
See how Palo Alto and Sunnyvale compare on other ordinance categories.
Want to add a third city?
Use our full comparison tool to compare up to three cities.
Open Comparison Tool