Fall in zone 4bPhoto: Dietmar Rabich, CC BY-SA 4.0, via Wikimedia Commons
Frost dates for ZIP 04773 (Aroostook County, ME)
Average last spring and first fall frost dates with 10%, 50% and 90% odds, from NOAA's 1991–2020 climate normals for the nearest weather station, Frenchville Aroostook AP, ME (4 miles away).
- Average last spring frostMay 650% chance of a 32°F freeze after this date
- Average first fall frostOct 250% chance of a 32°F freeze by this date
- Growing season (frost-free)147 daysmedian, 32°F threshold
- USDA hardiness zone4b-25 to -20°F avg. coldest night
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Frost and freeze alerts from the NWS forecast for 04773, the spring soil-temperature heads-up for pre-emergent, and a short weekly yard-timing email.
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This week in your yard
As of Oct 18, 2026, from your frost dates, zone and soil temperature. Lawn timing · Vegetables · Pruning · Plants
Soil temperature now
2-inch depth
44°F Below 50°F
24-hour average · latest 41°F, as of Oct 18, 2:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Limestone 4 NNW (27 mi).
4-inch depth
44°F Below 50°F
24-hour average · latest 42°F, as of Oct 18, 2:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Limestone 4 NNW (27 mi).
Fall: Texas A&M AgriLife times fall pre-emergent (for winter weeds such as annual bluegrass) to soil cooling to about 70°F for several days. The 50–55°F band is the spring trigger. Always read and follow the product label.
7-day forecast and frost risk
The latest National Weather Service 7-day forecast and any Frost Advisory or Freeze Warning for 04773 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
Soil is 44°F at 4 inches (estimated soil temperature, not a station reading). Fall pre-emergent window is mostly past. Next: spring, when soil reaches 50°F (typically mid-April to early May).
Fertilizer window
Lawn region: North (cool-season). Timing only; always follow the product label.
- Kentucky bluegrass (cool-season): Early fall: Around Labor Day (late August–September); Late fall: Late October–November, before the ground freezes; Late spring: Optional around Memorial Day. Avoid: Early-spring and midsummer feeding (pushes top growth, favors crabgrass).
Plant now
No vegetable planting windows are open this week.
Prune now
No frost-timed pruning windows are open this week.
Spring-flowering shrubs are pruned right after their flowers fade, not by date. See the pruning guide.
Last spring frost odds
| Chance of a 32°F freeze after this date | Date |
|---|---|
| 90% (early: most years still freeze after this) | Apr 25 |
| 50% (the "average" last frost) | May 6 |
| 10% (cautious: only 1 year in 10 freezes later) | May 21 |
Most gardeners plant frost-tender crops (tomatoes, peppers, basil) after the 50% date, and closer to the 10% date for less risk.
First fall frost odds
| Chance the first 32°F freeze has happened by this date | Date |
|---|---|
| 10% (early: 1 year in 10 freezes this soon) | Sep 18 |
| 50% (the "average" first frost) | Oct 2 |
| 90% (late: most years have frozen by now) | Oct 17 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | May 22 | Sep 22 |
| 32°F (freeze) | May 6 | Oct 2 |
| 28°F (hard freeze) | Apr 27 | Oct 17 |
n/a means NOAA did not publish a date at that threshold for this station (usually because it rarely gets that cold).
Vegetable planting calendar for 04773
Dates count from your average last spring frost (May 6) and first fall frost (Oct 2). Half of years have a frost after the spring date, so give tender crops (tomatoes, peppers, squash) some slack.
| Crop | Start indoors | Spring planting | Fall planting |
|---|---|---|---|
| Tomato | Mar 11–25 | May 13–27 (transplant) | – |
| Pepper (sweet and hot) | Feb 25–Mar 11 | May 20–Jun 3 (transplant) | – |
| Eggplant | Feb 25–Mar 11 | May 20–Jun 3 (transplant) | – |
| Tomatillo | Mar 11–25 | May 13–27 (transplant) | – |
| Lettuce | Mar 11–25 | Apr 15–May 6 (transplant) Apr 8–May 20 (sow outdoors) | Aug 7–28 (transplant) Jul 24–Aug 21 (sowing) |
| Spinach | – | Mar 25–Apr 15 (sow outdoors) | Aug 7–28 (sowing) |
| Kale | Mar 11–25 | Apr 8–22 (transplant) Apr 8–22 (sow outdoors) | Jul 10–Aug 7 (transplant) Jun 26–Jul 24 (sowing) |
| Collards | Mar 11–25 | Apr 8–May 6 (transplant) Apr 8–May 6 (sow outdoors) | Jul 10–Aug 7 (transplant) Jun 26–Jul 24 (sowing) |
| Broccoli | Feb 25–Mar 11 | Apr 8–22 (transplant) | Jun 26–Jul 24 (transplant) |
| Cabbage | Feb 25–Mar 11 | Apr 8–22 (transplant) | Jun 26–Jul 24 (transplant) |
| Cauliflower | Feb 25–Mar 11 | Apr 22–May 6 (transplant) | Jun 26–Jul 24 (transplant) |
| Brussels sprouts | Feb 11–25 | Apr 8–22 (transplant) | Jun 12–Jul 3 (transplant) |
| Kohlrabi | Mar 11–25 | Apr 8–22 (transplant) Apr 8–22 (sow outdoors) | Jul 24–Aug 7 (sowing) |
| Bok choy / Asian greens | – | Apr 8–22 (sow outdoors) | Aug 7–21 (sowing) |
| Arugula | – | Apr 8–May 6 (sow outdoors) | Aug 7–Sep 4 (sowing) |
| Mustard greens | – | Apr 8–29 (sow outdoors) | Aug 7–21 (sowing) |
| Swiss chard | Mar 25–Apr 8 | Apr 22–May 13 (transplant) Apr 22–May 20 (sow outdoors) | Jul 24–Aug 7 (sowing) |
| Beet | – | Apr 8–May 6 (sow outdoors) | Jul 24–Aug 7 (sowing) |
| Carrot | – | Apr 15–May 13 (sow outdoors) | Jul 10–24 (sowing) |
| Radish | – | Apr 1–May 13 (sow outdoors) | Aug 21–Sep 4 (sowing) |
| Turnip | – | Apr 8–29 (sow outdoors) | Jul 24–Aug 7 (sowing) |
| Parsnip | – | Apr 15–May 6 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Mar 11–Apr 8 (sow outdoors) | Jul 10–24 (sowing) |
| Onion (bulbing) | Feb 11–25 | Mar 25–Apr 8 (transplant) | – |
| Green onion / scallion | – | Mar 25–Apr 22 (sow outdoors) | Jul 24–Aug 7 (sowing) |
| Leek | Feb 11–25 | Apr 8–22 (transplant) | – |
| Garlic | – | – | Aug 21–Sep 18 (sowing) |
| Shallot | – | Mar 25–Apr 8 (transplant) | Aug 21–Sep 18 (sowing) |
| Potato | – | Apr 8–22 (transplant) | Jun 12–26 (transplant) |
| Sweet potato | – | May 27–Jun 10 (transplant) | – |
| Sweet corn | – | May 13–27 (sow outdoors) | – |
| Bean, bush (snap) | – | May 13–27 (sow outdoors) | – |
| Bean, pole | – | May 13–27 (sow outdoors) | – |
| Lima bean | – | May 20–Jun 3 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | May 27–Jun 17 (sow outdoors) | – |
| Cucumber | Apr 8–15 | May 13–27 (transplant) May 13–27 (sow outdoors) | – |
| Summer squash / zucchini | Apr 8–15 | May 13–27 (transplant) May 13–27 (sow outdoors) | – |
| Winter squash | Apr 8–15 | May 13–27 (transplant) May 13–27 (sow outdoors) | – |
| Pumpkin | – | May 13–27 (sow outdoors) | – |
| Watermelon | Apr 8–15 | May 20–Jun 3 (transplant) May 20–Jun 3 (sow outdoors) | – |
| Cantaloupe / muskmelon | Apr 8–15 | May 20–Jun 3 (transplant) May 20–Jun 3 (sow outdoors) | – |
| Okra | Mar 25–Apr 8 | May 20–Jun 3 (transplant) May 20–Jun 3 (sow outdoors) | – |
| Celery | Feb 11–25 | May 13–20 (transplant) | – |
| Basil | Mar 25–Apr 8 | May 13–27 (transplant) May 13–27 (sow outdoors) | – |
| Cilantro | – | Apr 22–May 20 (sow outdoors) | Aug 7–21 (sowing) |
| Parsley | Feb 25–Mar 11 | Apr 22–May 6 (transplant) Apr 15–May 6 (sow outdoors) | – |
| Dill | – | May 6–20 (sow outdoors) | Aug 7–21 (sowing) |
| Sunflower | – | May 6–20 (sow outdoors) | – |
| Asparagus (crowns) | – | Apr 8–22 (transplant) | – |
| Rhubarb (crowns) | – | Apr 8–22 (transplant) | – |
| Strawberry (plants) | – | Apr 8–22 (transplant) | Jul 24–Aug 21 (transplant) |
Typical ranges from university extension planting calendars, adjusted to your frost dates. Probabilities, not guarantees. Fall windows that would overlap spring planting are left out, as are fall crops of frost-tender plants where the frost-free season is under 210 days.
Where these numbers come from
Station: Frenchville Aroostook AP, ME (NOAA GHCN-Daily ID USW00004836), elevation 988 ft, 4.4 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Van Buren 2, ME | 15 mi | May 23 | Sep 26 |
| Ft Kent, ME | 18 mi | May 23 | Sep 24 |
| Limestone 4 NNW, ME | 27 mi | May 16 | Sep 24 |
The average last-frost dates of these stations span 17 days, a rough guide to local variation. See data sources & methods.
Frost questions for 04773
When is the last frost in 04773?
The average (50% chance) last spring freeze of 32°F for ZIP 04773 is May 6. For a more cautious planting date, use May 21, when only 1 year in 10 still sees a later freeze.
When is the first frost in 04773?
The average first fall freeze is October 2. In 1 year in 10 it comes by September 18.
What hardiness zone is 04773?
ZIP 04773 is in USDA zone 4b (-25 to -20°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 04773 right now?
This page shows the latest 2-inch and 4-inch soil temperature from the nearest public soil station (USDA SCAN, NOAA USCRN or TexMesonet), or a labeled estimate when no station is close, against the 50–55°F spring pre-emergent band.
Nearby ZIP codes
04746 Grand Isle 04772 04756 Madawaska 04745 04779 04785 Van Buren 04783 04781
Other ZIP codes in Aroostook County
04451 04459 04471 04497 04730 04732 04733 04734 04735 04736 04737 04739 04740 04742 04743 04745 04746 04747 04750 04756 04757 04758 04760 04761 All Aroostook County frost dates · Maine frost dates
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Free. One weekly email plus alerts when your ZIP has a frost or a soil-temperature change worth acting on. After you submit, Kit (our email provider) sends a confirmation email: check your email and click the link to confirm. You aren't subscribed until you do. We collect only your email address and ZIP, sent to Kit to deliver The Dial. Unsubscribe anytime.