Frost dates for Rock Island, 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 8
typical year
Safe to plant
April 23
frost is over in 9 of 10 years
First fall frost
October 24
typical year
Growing season
200 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 11 – 25 | – |
| Spinach | – | Feb 25 – Mar 18 | Aug 29 – Sep 12 |
| Lettuce | – | Mar 11 – Apr 1 | Aug 29 – Sep 12 |
| Radishes | – | Mar 11 – Apr 22 | Sep 12 – 26 |
| Onions | – | Mar 11 – 25 | – |
| Potatoes | – | Mar 18 – Apr 1 | – |
| Carrots | – | Mar 18 – Apr 8 | Aug 1 – 15 |
| Beets | – | Mar 11 – 25 | Aug 15 – 29 |
| Kale | Jan 28 – Feb 11 | Mar 11 – 25 | Aug 15 – 29 |
| Broccoli | Jan 28 – Feb 11 | Mar 25 – Apr 8 | Aug 15 – 29 |
| Cabbage | Jan 14 – 28 | Mar 11 – 25 | Aug 15 – 29 |
| Garlic | – | – | Sep 12 – Oct 3 |
| Warm-season crops | |||
| Tomatoes | Feb 26 – Mar 12 | Apr 23 – May 7 | – |
| Peppers | Feb 19 – Mar 5 | Apr 30 – May 14 | – |
| Cucumbers | – | Apr 23 – May 14 | – |
| Zucchini | – | Apr 23 – May 21 | – |
| Pumpkins | – | Apr 23 – May 14 | – |
| Green beans | – | Apr 23 – Aug 15 | – |
| Sweet corn | – | Apr 23 – May 21 | – |
| Basil | Mar 19 – Apr 2 | Apr 30 – May 7 | – |
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 | April 23 | April 8 | March 20 |
| Fall frost before | October 12 | October 24 | November 5 |
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 17 (April 6 in a late year), and the first one in fall around November 4.
Towns that use these dates
This is the nearest NOAA station with frost records for 1 town.
Rock Island
Where these dates come from
NOAA weather station WENATCHEE PANGBORN AP, WA US (USW00094239), 1991–2020 climate normals. It's the nearest station for 4 zip codes, all within 13 miles:
98802, 98828, 98845, 98850
Planting dates follow common university extension advice; your local extension service can fine-tune them for your soil and microclimate.