Frost dates for Lynden, WA
When the last spring frost and first fall frost usually come, and when to plant, from 30 years of NOAA weather records.
Last spring frost
April 18
typical year
Safe to plant
May 5
frost is over in 9 of 10 years
First fall frost
October 18
typical year
Growing season
185 days
frost-free, typical year
Frost watch this week
Tonight's and the next six nights' lows from the National Weather Service forecast for the station's location. Frost: 32°F or colder. Possible frost: 33–36°F, mostly in low spots on clear, still nights.
When to plant
Counted from this page's frost dates. Warm-season crops wait for the safe-to-plant date.
| Crop | Start indoors | Plant outside | Fall planting |
|---|---|---|---|
| Cool-season crops | |||
| Peas | – | Mar 21 – Apr 4 | – |
| Spinach | – | Mar 7 – 28 | Aug 23 – Sep 6 |
| Lettuce | – | Mar 21 – Apr 11 | Aug 23 – Sep 6 |
| Radishes | – | Mar 21 – May 2 | Sep 6 – 20 |
| Onions | – | Mar 21 – Apr 4 | – |
| Potatoes | – | Mar 28 – Apr 11 | – |
| Carrots | – | Mar 28 – Apr 18 | Jul 26 – Aug 9 |
| Beets | – | Mar 21 – Apr 4 | Aug 9 – 23 |
| Kale | Feb 7 – 21 | Mar 21 – Apr 4 | Aug 9 – 23 |
| Broccoli | Feb 7 – 21 | Apr 4 – 18 | Aug 9 – 23 |
| Cabbage | Jan 24 – Feb 7 | Mar 21 – Apr 4 | Aug 9 – 23 |
| Garlic | – | – | Sep 6 – 27 |
| Warm-season crops | |||
| Tomatoes | Mar 10 – 24 | May 5 – 19 | – |
| Peppers | Mar 3 – 17 | May 12 – 26 | – |
| Cucumbers | – | May 5 – 26 | – |
| Zucchini | – | May 5 – Jun 2 | – |
| Pumpkins | – | May 5 – 26 | – |
| Green beans | – | May 5 – Aug 9 | – |
| Sweet corn | – | May 5 – Jun 2 | – |
| Basil | Mar 31 – Apr 14 | May 12 – 19 | – |
Onions: from sets. Green beans: until 10 weeks before the first fall frost. Garlic: harvest next summer.
The year at a glance
Start indoors Plant outside Fall planting
The chance of frost, by date
| 1 year in 10 | Half of years | 9 years in 10 | |
|---|---|---|---|
| Spring frost after | May 5 | April 18 | March 27 |
| Fall frost before | September 28 | October 18 | November 8 |
Frost here means 32°F or colder. Read across: in 1 year in 10, spring frost carries on past the first date, which is why that date is the safe-to-plant date.
Hard freeze (28°F)
A hard freeze kills most garden plants, even hardy ones. The last one in spring usually comes around March 18 (April 8 in a late year), and the first one in fall around November 7.
Towns that use these dates
This is the nearest NOAA station with frost records for 4 towns.
Lynden, Everson, Nooksack, Sumas
Where these dates come from
NOAA weather station CLEARBROOK, WA US (USC00451484), 1991–2020 climate normals. It's the nearest station for 5 zip codes, all within 13 miles:
98247, 98264, 98266, 98276, 98295
Planting dates follow common university extension advice; your local extension service can fine-tune them for your soil and microclimate.