Frost dates for Oceanside, California
Oceanside doesn't get a freezing night every winter: about 98 years in 100 have one. In those years, half have had their last frost by February 16 and half their first by December 8.
Frost dates for
Oceanside, California
Last spring frost
February 16
Not every winter has one: about 98 years in 100 have a freezing night here. In those years, half have their last frost by this date, and 1 in 10 still have one after March 18.
First fall frost
December 8
In years with a freeze, half have their first one by this date, and 1 in 10 by November 21.
Growing season
298 days
Frost-free days in a typical year. 9 years in 10 get at least 262.
Hardiness zone
10a
2023 USDA map: the coldest night of winter averages 30°F to 35°F. On the 2012 map it was 10b, half a zone warmer. ZIP codes within about 6 miles of the city's center: 10 in 10a and 1 in 10b.
Stations near you disagree. NOAA's Camp Pendleton MCAS (6 miles away, at 80 feet above sea level), the one we used, gives a typical last frost of February 16 and a typical first frost of December 8. NOAA's Oceanside Municipal Airport (2 miles away, at 30 feet above sea level) gives a typical last frost of January 23 and a typical first frost of December 11. So the typical last frost could fall anywhere from January 23 to February 16 and the typical first frost from December 8 to 11, depending on whether your garden is more like one or the other. Local terrain matters: hillsides, valley floors, water and city heat can change frost dates a lot over a few miles. Treat the dates here as a starting point, and compare with a nearby gardener or your county extension office.
Print a year planner for Oceanside
Frost risk through the year
How sure are these dates?
A frost date is a probability, not a promise. NOAA worked out, from 30 years of nightly lows, how often the last spring frost and the first fall frost fall on each date. The middle column is the typical year. The outer columns are the early and late years that come about once a decade.
| Early year 1 in 10 | Typical year 1 in 2 | Late year 1 in 10 | |
|---|---|---|---|
| Last frost in spring | December 31 | February 16 | March 18 |
| First frost in fall | November 21 | December 8 | January 2 |
The frost-free season between them runs 298 days in a typical year. In 1 year in 10 it is 340 days or longer, and in 1 year in 10 it is 262 days or shorter.
- Hard freeze (28°F): about 71 years in 100 have one. In those years the last typically comes on January 11 and the first on December 22. It is a harder freeze than the 32°F frost line, cold enough to damage many garden plants; how hardy a crop is decides whether it comes through. (The National Weather Service's own hard-freeze threshold varies from office to office.)
- Frost possible (36°F at the station): typically last on March 12 and first on November 21. On clear, still nights the ground can be several degrees colder than the thermometer, so frost can form on plants when the official reading is in the mid-30s.
Planting calendar for Oceanside
These dates count from the typical last and first frosts, using the planting rules published by Colorado State University Extension (spring), Virginia Cooperative Extension (fall crops) and University of Minnesota Extension (garlic, where winters are hard). Weather in any one year can run early or late, so check the forecast before you plant tender crops.
Frost doesn't come every year here: about 98 years in 100 have at least one freezing night. The calendar is built on the dates for the years that do.
We don't give a garlic date here. The rule we use, from the University of Minnesota Extension, counts from the first killing frost, and it works where a hard freeze comes every year before the ground freezes. Your county's extension office can tell you when to plant garlic in your climate.
| When | What to do | Why then |
|---|---|---|
| January | ||
| January 5 to 19 | Peppers Start seeds indoors | 6 to 8 weeks before planting out |
| January 12 to 26 | Tomatoes Start seeds indoors | 5 to 7 weeks before planting out |
| January 19 to February 2 | Peas, spinach, lettuce, radishes, onion sets, turnips Sow outdoors, as early as | hardy crops: 2 to 4 weeks before the typical last frost |
| January 19 to February 2 | Broccoli and cabbage Plant out, as early as | hardy crops: 2 to 4 weeks before the typical last frost |
| February | ||
| February 2 to 16 | Beets, carrots, potatoes, Swiss chard Plant outdoors, as early as | semi-hardy crops: up to 2 weeks before the typical last frost |
| February 2 to 16 | Cauliflower Plant out, as early as | semi-hardy: up to 2 weeks before the typical last frost |
| February 16 | Snap beans, sweet corn, cucumbers, summer squash Sow outdoors around | tender crops: around the typical last frost date |
| March | ||
| March 2 | Tomatoes, peppers, eggplant Plant out from | very tender: 2 weeks or more after the typical last frost |
| March 2 | Melons, winter squash, pumpkins, lima beans Sow outdoors from | very tender: 2 weeks or more after the typical last frost |
| July | ||
| July 13 to 27 | Cabbage for fall Start seeds | set the plants out by August 31 |
| August | ||
| August 2 to 16 | Broccoli for fall Start seeds | set the plants out by September 20 |
| September | ||
| September 11 | Snap beans for fall Last date to sow | 60 days to harvest, plus 2 weeks for slower fall growth, plus 2 weeks because frost kills it |
| September 15 | Carrots for fall Last date to sow | 70 days to harvest, plus 2 weeks for slower fall growth |
| September 16 | Cucumbers for fall Last date to sow | 55 days to harvest, plus 2 weeks for slower fall growth, plus 2 weeks because frost kills it |
| September 20 | Peas for fall Last date to sow | 65 days to harvest, plus 2 weeks for slower fall growth |
| September 21 | Summer squash for fall Last date to sow | 50 days to harvest, plus 2 weeks for slower fall growth, plus 2 weeks because frost kills it |
| September 25 | Leaf lettuce and beets for fall Last date to sow | 60 days to harvest, plus 2 weeks for slower fall growth |
| October | ||
| October 5 | Turnips and kohlrabi for fall Last date to sow | 50 days to harvest, plus 2 weeks for slower fall growth |
| October 15 | Spinach for fall Last date to sow | 40 days to harvest, plus 2 weeks for slower fall growth |
| October 25 | Radishes for fall Last date to sow | 30 days to harvest, plus 2 weeks for slower fall growth |
| November | ||
| November 21 | Tomatoes, peppers, squash, melons, cucumbers Watch the forecast from | in 1 fall in 10 the first frost comes by this date; pick tender crops before a frost |
| December | ||
| December 1 to 29 | Broccoli and cabbage Start seeds indoors | 5 to 7 weeks before planting them out |
| December 15 to January 12 | Cauliflower Start seeds indoors | 5 to 7 weeks before planting out |
| December 29 to January 19 | Eggplant Start seeds indoors | 6 to 9 weeks before planting out |
Want more insurance? Shift every spring date 30 days later. That plans around March 18, the date after which only 1 spring in 10 has a frost.
For spring bulbs such as tulips and daffodils, plant once the soil has cooled to about 50 to 55°F and keep going until a couple of weeks before the ground freezes. Our guide to fall planting explains how to tell.
Where these numbers come from
These dates come from NOAA's weather station Camp Pendleton MCAS (station USW00003154), 6 miles from the center of Oceanside. It sits 130 feet lower, at 80 feet above sea level. NOAA rates this station's record as representative: at least 10 of the 30 years, with the gaps filled from nearby stations.
The same station also gives the frost dates for San Clemente.
Our ZIP code lookup matches these 3 ZIP codes to the same station, so they get the same dates: 92028, 92055, 92057. Hardiness zones are worked out separately for each ZIP code.
Nearby places
- Escondido, California: frost not every year (15 miles away)
- Temecula, California: frost not every year (20 miles away)
- Menifee, California: frost not every year (35 miles away)
See frost dates across California, or look up your own ZIP code for the station nearest you. Want the background? Read what a last frost date really means.