Frost dates for Westport Island, ME
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 28
typical year
Safe to plant
May 9
frost is over in 9 of 10 years
First fall frost
October 21
typical year
Growing season
175 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 31 – Apr 14 | – |
| Spinach | – | Mar 17 – Apr 7 | Aug 26 – Sep 9 |
| Lettuce | – | Mar 31 – Apr 21 | Aug 26 – Sep 9 |
| Radishes | – | Mar 31 – May 12 | Sep 9 – 23 |
| Onions | – | Mar 31 – Apr 14 | – |
| Potatoes | – | Apr 7 – 21 | – |
| Carrots | – | Apr 7 – 28 | Jul 29 – Aug 12 |
| Beets | – | Mar 31 – Apr 14 | Aug 12 – 26 |
| Kale | Feb 17 – Mar 3 | Mar 31 – Apr 14 | Aug 12 – 26 |
| Broccoli | Feb 17 – Mar 3 | Apr 14 – 28 | Aug 12 – 26 |
| Cabbage | Feb 3 – 17 | Mar 31 – Apr 14 | Aug 12 – 26 |
| Garlic | – | – | Sep 9 – 30 |
| Warm-season crops | |||
| Tomatoes | Mar 14 – 28 | May 9 – 23 | – |
| Peppers | Mar 7 – 21 | May 16 – 30 | – |
| Cucumbers | – | May 9 – 30 | – |
| Zucchini | – | May 9 – Jun 6 | – |
| Pumpkins | – | May 9 – 30 | – |
| Green beans | – | May 9 – Aug 12 | – |
| Sweet corn | – | May 9 – Jun 6 | – |
| Basil | Apr 4 – 18 | May 16 – 23 | – |
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 9 | April 28 | April 16 |
| Fall frost before | October 5 | October 21 | November 4 |
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 April 13 (April 26 in a late year), and the first one in fall around November 4.
Where these dates come from
NOAA weather station WESTPORT ISLAND, ME US (USC00179547), 1991–2020 climate normals. It's the nearest station for 12 zip codes, all within 10 miles:
04537, 04538, 04544, 04548, 04554, 04558, 04562, 04568, 04570, 04571, 04575, 04576
Planting dates follow common university extension advice; your local extension service can fine-tune them for your soil and microclimate.