Your climate reference
near Alto.
We connect a real Census place to the nearest agricultural NOAA station, then show the distance and the limitations. This is not a locally validated planting calendar.
CDP · Census 2026A seasonal station and a mild-climate or limited-data station are not interchangeable. The nearest source has not been replaced to force a calendar.
3.8 miles N
from the Census reference point.
The line connects Alto’s published Census internal point to the weather station. It does not measure terrain, elevation differences or your garden’s microclimate.
6.1 km straight-line distance · Schematic, not a navigation mapKentfield
Seasonal freeze reference · USC00044500
One date never tells
the whole season.
1991–2020 station normals
32°F minimum-temperature threshold
Last spring freeze
Among cold seasons with a freeze: probability of the last occurrence on this date or later.
The 10% date is later in spring than the median: a more cautious historical reference, still not a guarantee.
First fall freeze
Among cold seasons with a freeze: probability of the first occurrence on this date or earlier.
The 10% date is earlier in fall than the median: a more cautious harvest-planning reference.
These percentages are conditional on a cold season containing a 32°F freeze; they are not probabilities across all years. They describe historical climate, not this season’s forecast. The spring and fall probability directions are intentionally different. A garden can be warmer or colder than the reference station.
Nearby station comparisons
Differences can signal exposure, elevation, location or data-quality effects.
| NOAA reference | Distance | Conditional spring median | Conditional fall median | Status |
|---|---|---|---|---|
| Kentfield | 3.8 mi | Jan 16 | Dec 18 | Seasonal freeze reference |
| San Rafael Civic Ctr | 6.5 mi | Jan 11 | Dec 21 | Seasonal freeze reference |
| Richmond | 7.8 mi | Jan 4 | Jan 2 (next year) | Infrequent freezing; conditional dates |
Available alternative-station median spread: spring 5 days; fall 3 days. This is a comparison of source references, not a measure of garden uncertainty.
Date probabilities apply among cold seasons with a 32°F freeze, not all years. Check each station’s annual occurrence and quality before comparing.
A traceable place.
- Official Census name
- Alto CDP
- Census GEOID
- 0601416
- Published internal point
- 37.9056, -122.5187
- Land area
- 0.3 km²
- Water area
- 0.0 km²
The published point is inside the Census geography. It is not your address and does not represent every neighborhood or elevation within the place.
Original Census GazetteerMake the next
decision locally.
A date window alone cannot tell you which crops are suitable today. Check the current forecast, soil warmth, cultivar maturity and regional extension guidance.
Explore crop-specific evidence Current NWS point forecast Find university extension resourcesFind your local climate reference
Choose a state, then search its cities, towns and Census-designated places.
Choose a state to search the national Census place inventory.
Census places are not ZIP codes. A nearby station is a reference, not a garden-level measurement. Distance and data limitations are shown before any calculation.