Frost dates for 94062Redwood City, CA
The average last spring frost in Redwood City is March 21 and the average first fall frost is December 15, giving a typical growing season of about 275 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Mar 21
- Average first fall frost
- Dec 15
- Growing season
- 275 days
Safer after Apr 28 (1-in-10 risk)
Possible by Nov 21 (1-in-10 risk)
First frost typically in 49 days
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | Mar 25 · Apr 26 · May 27 | Nov 4 · Nov 25 · Dec 15 | 212 days | 100% |
| Frost / freeze (32°F) | Jan 19 · Mar 21 · Apr 28 | Nov 21 · Dec 15 · Jan 30 | 275 days | 98% |
| Hard freeze (28°F) | Dec 15 · Jan 29 · Mar 30 | Dec 3 · Jan 4 · Mar 9 | 361 days | 56% |
Planting calendar for Redwood City
Planting windows from the University of Maryland Extension calendar, shifted to your average frost dates. Use them as a starting point and adjust for seed packet instructions and local conditions.
| Crop | Task | Window |
|---|---|---|
| Tomatoes | Start seeds indoors | Feb 18 – Apr 26 |
| Tomatoes | Transplant outdoors | Apr 6 – Aug 25 |
| Peppers | Start seeds indoors | Feb 18 – Mar 21 |
| Peppers | Transplant outdoors | Apr 20 – May 21 |
| Eggplant | Start seeds indoors | Mar 7 – Apr 5 |
| Eggplant | Transplant outdoors | Apr 20 – May 21 |
| Cucumbers | Sow outdoors | Apr 20 – Sep 4 |
| Summer squash | Sow outdoors | Apr 6 – May 21 |
| Winter squash & pumpkins | Sow outdoors | Apr 20 – May 21 |
| Snap beans | Sow outdoors | Apr 6 – Sep 27 |
| Sweet corn | Sow outdoors | Apr 6 – Aug 25 |
| Watermelon & cantaloupe | Sow outdoors | Apr 20 – May 21 |
| Okra | Sow outdoors | Apr 13 – May 6 |
| Peas | Sow outdoors (spring) | Feb 18 – Apr 5 |
| Potatoes | Plant outdoors (spring) | Feb 18 – Apr 20 |
| Onions | Start seeds indoors (spring) | Jan 7 – Feb 3 |
| Onions | Transplant outdoors (spring) | Mar 7 – Apr 5 |
| Broccoli | Start seeds indoors (spring) | Jan 31 – Mar 6 |
| Broccoli | Transplant outdoors (spring) | Mar 7 – Apr 5 |
| Broccoli | Start seeds indoors (fall) | Aug 15 – Aug 25 |
| Broccoli | Transplant outdoors (fall) | Sep 14 – Sep 25 |
| Cabbage | Start seeds indoors (spring) | Jan 21 – Feb 18 |
| Cabbage | Transplant outdoors (spring) | Feb 18 – Mar 21 |
| Cabbage | Start seeds indoors (fall) | Aug 5 – Sep 4 |
| Cabbage | Transplant outdoors (fall) | Sep 4 – Oct 5 |
| Leaf lettuce | Sow outdoors (spring) | Feb 18 – May 6 |
| Leaf lettuce | Sow outdoors (fall) | Sep 4 – Oct 21 |
| Spinach | Sow outdoors (spring) | Feb 11 – Mar 27 |
| Spinach | Sow outdoors (fall) | Sep 21 – Oct 26 |
| Radishes | Sow outdoors (spring) | Feb 18 – Apr 10 |
| Radishes | Sow outdoors (fall) | Sep 4 – Nov 5 |
| Kale | Sow outdoors (spring) | Mar 7 – Mar 27 |
| Kale | Sow outdoors (fall) | Aug 28 – Oct 5 |
| Carrots | Sow outdoors (spring) | Mar 21 – May 6 |
| Carrots | Sow outdoors (fall) | Aug 5 – Sep 20 |
| Garlic | Plant outdoors (fall) | Dec 5 – Jan 5 |
Where these dates come from
ZIP code 94062 is matched to the NOAA station Skyline Ridge Preserve, CA, 15.8 km away, at 2,270 ft elevation (662 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Skyline Ridge Preserve, CA (used) | 2,270 ft | Mar 21 | Dec 15 |
| Woodside Fire Stn 1, CA | 380 ft | Feb 25 | Nov 25 |
| Redwood City, CA | 31 ft | Jan 17 | Dec 12 |
| San Gregorio 2 Se, CA | 275 ft | Mar 2 | Nov 25 |
Frost dates near Redwood City
- Menlo Park, CA 94026 · last Feb 25, first Nov 25
- Redwood City, CA 94064 · last Feb 25, first Nov 25
- San Carlos, CA 94070 · last Jan 17, first Dec 12
- Portola Valley, CA 94028 · last Feb 25, first Nov 25
- Atherton, CA 94027 · last Jan 17, first Dec 12
- Palo Alto, CA 94304 · last Feb 1, first Dec 7
- Belmont, CA 94002 · last Jan 17, first Dec 12
- Stanford, CA 94305 · last Feb 1, first Dec 7
Frequently asked questions
- When is the last frost in Redwood City, CA?
- For ZIP code 94062, the average last spring frost (32°F) is March 21, based on NOAA 1991-2020 climate normals for the Skyline Ridge Preserve, CA weather station. There is a 1-in-10 chance of a frost after April 28.
- When is the first frost in Redwood City, CA?
- The average first fall frost (32°F) is December 15. There is a 1-in-10 chance of frost by November 21, so tender plants are at risk from that point on.
- How long is the growing season in 94062?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 275 days long.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.