Frost dates for Plano, Texas
In Plano, half of springs have had their last frost by March 7 (and 1 spring in 10 still has one after March 29), and half of falls have had their first frost by November 21, leaving about 259 frost-free days in a typical year. Here is how sure those dates are, what they mean for planting, and where they come from.
Frost dates for
Plano, Texas
Last spring frost
March 7
Half of springs have their last frost by this date. For a safer bet, wait until March 29: only 1 spring in 10 has a frost after that.
First fall frost
November 21
Half of falls have their first frost by this date. In 1 fall in 10 it comes by November 2.
Growing season
259 days
Frost-free days in a typical year. 9 years in 10 get at least 232.
Hardiness zone
8b
2023 USDA map: the coldest night of winter averages 15°F to 20°F. On the 2012 map it was 8a, half a zone colder. All 10 ZIP codes within about 6 miles of the city's center are in zone 8b.
Print a year planner for Plano
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 | February 18 | March 7 | March 29 |
| First frost in fall | November 2 | November 21 | December 9 |
The frost-free season between them runs 259 days in a typical year. In 1 year in 10 it is 285 days or longer, and in 1 year in 10 it is 232 days or shorter.
- Hard freeze (28°F): typically last on February 24 and first on December 4. 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 21 and first on November 10. 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.
In 8 springs out of 10, the last frost in Plano comes between February 18 and March 29, a window of 39 days. That is wider than at most NOAA stations (the typical window is 31 days), so spring here is less predictable than average: lean toward the later date.
Among Texas's 387 NOAA stations with a frost every year, 77 percent have their typical last frost later than Plano does.
Planting calendar for Plano
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.
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 3 to 31 | Cauliflower Start seeds indoors | 5 to 7 weeks before planting out |
| January 17 to February 7 | Eggplant Start seeds indoors | 6 to 9 weeks before planting out |
| January 24 to February 7 | Peppers Start seeds indoors | 6 to 8 weeks before planting out |
| January 31 to February 14 | Tomatoes Start seeds indoors | 5 to 7 weeks before planting out |
| February | ||
| February 7 to 21 | Peas, spinach, lettuce, radishes, onion sets, turnips Sow outdoors, as early as | hardy crops: 2 to 4 weeks before the typical last frost |
| February 7 to 21 | Broccoli and cabbage Plant out, as early as | hardy crops: 2 to 4 weeks before the typical last frost |
| February 21 to March 7 | Beets, carrots, potatoes, Swiss chard Plant outdoors, as early as | semi-hardy crops: up to 2 weeks before the typical last frost |
| February 21 to March 7 | Cauliflower Plant out, as early as | semi-hardy: up to 2 weeks before the typical last frost |
| March | ||
| March 7 | Snap beans, sweet corn, cucumbers, summer squash Sow outdoors around | tender crops: around the typical last frost date |
| March 21 | Tomatoes, peppers, eggplant Plant out from | very tender: 2 weeks or more after the typical last frost |
| March 21 | Melons, winter squash, pumpkins, lima beans Sow outdoors from | very tender: 2 weeks or more after the typical last frost |
| June | ||
| June 26 to July 10 | Cabbage for fall Start seeds | set the plants out by August 14 |
| July | ||
| July 16 to 30 | Broccoli for fall Start seeds | set the plants out by September 3 |
| August | ||
| August 25 | 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 |
| August 29 | Carrots for fall Last date to sow | 70 days to harvest, plus 2 weeks for slower fall growth |
| August 30 | 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 | ||
| September 3 | Peas for fall Last date to sow | 65 days to harvest, plus 2 weeks for slower fall growth |
| September 4 | 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 8 | Leaf lettuce and beets for fall Last date to sow | 60 days to harvest, plus 2 weeks for slower fall growth |
| September 18 | Turnips and kohlrabi for fall Last date to sow | 50 days to harvest, plus 2 weeks for slower fall growth |
| September 28 | Spinach for fall Last date to sow | 40 days to harvest, plus 2 weeks for slower fall growth |
| October | ||
| October 8 | Radishes for fall Last date to sow | 30 days to harvest, plus 2 weeks for slower fall growth |
| November | ||
| November 2 | 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 20 to January 17 | Broccoli and cabbage Start seeds indoors | 5 to 7 weeks before planting them out |
Want more insurance? Shift every spring date 22 days later. That plans around March 29, 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 Richardson (station USC00417588), 4 miles from the center of Plano. It sits at about the same elevation, 680 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 Richardson.
Our ZIP code lookup matches these 28 ZIP codes to the same station, so they get the same dates: 75001, 75010, 75013, 75023, 75024, 75025, 75033, 75034, 75035, 75041, 75042, 75044, 75074, 75075, 75080, 75081, 75082, 75093, 75230, 75238, 75240, 75243, 75244, 75248, 75251, 75252, 75254, 75287. Hardiness zones are worked out separately for each ZIP code.
Nearby places
- Frisco, Texas: last frost around March 18, first frost around November 11 (8 miles away)
- Dallas, Texas: last frost around March 2, first frost around November 29 (20 miles away)
- Irving, Texas: last frost around March 8, first frost around November 24 (20 miles away)
See frost dates across Texas, or look up your own ZIP code for the station nearest you. Want the background? Read what a last frost date really means.