Frost dates for ZIP 20317 (Washington, DC)
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, Natl Arboretum Dc, MD (3 miles away).
- Average last spring frostMar 2950% chance of a 32°F freeze after this date
- Average first fall frostNov 850% chance of a 32°F freeze by this date
- Growing season (frost-free)224 daysmedian, 32°F threshold
- USDA hardiness zone7b5 to 10°F avg. coldest night
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This week in your yard
As of Oct 17, 2026, from your frost dates, zone and soil temperature. Lawn timing · Vegetables · Pruning · Plants
Soil temperature now
2-inch depth
64°F 55°F or warmer
24-hour average · latest 61°F, as of Oct 17, 10:00 PM CDT
Measured at USDA NRCS SCAN station Powder Mill, 11 mi away. Daily averages: Thu 66°, Fri 66°.
4-inch depth
64°F 55°F or warmer
24-hour average · latest 60°F, as of Oct 17, 10:00 PM CDT
Measured at USDA NRCS SCAN station Powder Mill, 11 mi away. Daily averages: Thu 68°, Fri 68°.
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 20317 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
Soil is 64°F at 4 inches. Fall pre-emergent (annual bluegrass, winter weeds): window open as soil cools through the 70s and 60s.
Fertilizer window
Lawn region: Transition zone. Timing only; always follow the product label.
- Bermudagrass (warm-season): Spring: Several weeks after the lawn is fully green (April–May) (about May 14 here, using green-up about 3–4 weeks after your average last frost); Summer: Every 4–6 weeks through mid-August (heaviest feeder of the group); Late: Light, low-nitrogen/high-potassium feeding about 4 weeks before first frost, or skip. Avoid: Heavy late-fall nitrogen (linked to spring dead spot).
- Tall fescue (cool-season): Early fall: September (main feeding); Late fall: November, while still green; Late winter: Optional light feeding February–March. Avoid: Feeding after mid-spring and through summer in the transition zone (stress and brown patch).
Plant now
Prune now
No frost-timed pruning windows are open this week.
Your average first frost is Nov 8: skip heavy pruning in the 6–8 weeks before it, because new growth may not harden off in time.
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) | Mar 15 |
| 50% (the "average" last frost) | Mar 29 |
| 10% (cautious: only 1 year in 10 freezes later) | Apr 11 |
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) | Oct 26 |
| 50% (the "average" first frost) | Nov 8 |
| 90% (late: most years have frozen by now) | Nov 23 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | Apr 10 | Oct 29 |
| 32°F (freeze) | Mar 29 | Nov 8 |
| 28°F (hard freeze) | Mar 17 | Nov 20 |
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 20317
Dates count from your average last spring frost (Mar 29) and first fall frost (Nov 8). 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 | Feb 1–15 | Apr 5–19 (transplant) | Jul 12–Aug 9 (transplant) |
| Pepper (sweet and hot) | Jan 18–Feb 1 | Apr 12–26 (transplant) | Jul 19–Aug 9 (transplant) |
| Eggplant | Jan 18–Feb 1 | Apr 12–26 (transplant) | Jul 19–Aug 9 (transplant) |
| Tomatillo | Feb 1–15 | Apr 5–19 (transplant) | – |
| Lettuce | Feb 1–15 | Mar 8–29 (transplant) Mar 1–Apr 12 (sow outdoors) | Sep 13–Oct 4 (transplant) Aug 30–Sep 27 (sowing) |
| Spinach | – | Feb 15–Mar 8 (sow outdoors) | Sep 13–Oct 4 (sowing) |
| Kale | Feb 1–15 | Mar 1–15 (transplant) Mar 1–15 (sow outdoors) | Aug 16–Sep 13 (transplant) Aug 2–30 (sowing) |
| Collards | Feb 1–15 | Mar 1–29 (transplant) Mar 1–29 (sow outdoors) | Aug 16–Sep 13 (transplant) Aug 2–30 (sowing) |
| Broccoli | Jan 18–Feb 1 | Mar 1–15 (transplant) | Aug 2–30 (transplant) |
| Cabbage | Jan 18–Feb 1 | Mar 1–15 (transplant) | Aug 2–30 (transplant) |
| Cauliflower | Jan 18–Feb 1 | Mar 15–29 (transplant) | Aug 2–30 (transplant) |
| Brussels sprouts | Jan 4–18 | Mar 1–15 (transplant) | Jul 19–Aug 9 (transplant) |
| Kohlrabi | Feb 1–15 | Mar 1–15 (transplant) Mar 1–15 (sow outdoors) | Aug 30–Sep 13 (sowing) |
| Bok choy / Asian greens | – | Mar 1–15 (sow outdoors) | Sep 13–27 (sowing) |
| Arugula | – | Mar 1–29 (sow outdoors) | Sep 13–Oct 11 (sowing) |
| Mustard greens | – | Mar 1–22 (sow outdoors) | Sep 13–27 (sowing) |
| Swiss chard | Feb 15–Mar 1 | Mar 15–Apr 5 (transplant) Mar 15–Apr 12 (sow outdoors) | Aug 30–Sep 13 (sowing) |
| Beet | – | Mar 1–29 (sow outdoors) | Aug 30–Sep 13 (sowing) |
| Carrot | – | Mar 8–Apr 5 (sow outdoors) | Aug 16–30 (sowing) |
| Radish | – | Feb 22–Apr 5 (sow outdoors) | Sep 27–Oct 11 (sowing) |
| Turnip | – | Mar 1–22 (sow outdoors) | Aug 30–Sep 13 (sowing) |
| Parsnip | – | Mar 8–29 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Feb 1–Mar 1 (sow outdoors) | Aug 16–30 (sowing) |
| Onion (bulbing) | Jan 4–18 | Feb 15–Mar 1 (transplant) | – |
| Green onion / scallion | – | Feb 15–Mar 15 (sow outdoors) | Aug 30–Sep 13 (sowing) |
| Leek | Jan 4–18 | Mar 1–15 (transplant) | – |
| Garlic | – | – | Sep 27–Oct 25 (sowing) |
| Shallot | – | Feb 15–Mar 1 (transplant) | Sep 27–Oct 25 (sowing) |
| Potato | – | Mar 1–15 (transplant) | Jul 19–Aug 2 (transplant) |
| Sweet potato | – | Apr 19–May 3 (transplant) | – |
| Sweet corn | – | Apr 5–19 (sow outdoors) | – |
| Bean, bush (snap) | – | Apr 5–19 (sow outdoors) | Aug 16–30 (sowing) |
| Bean, pole | – | Apr 5–19 (sow outdoors) | – |
| Lima bean | – | Apr 12–26 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Apr 19–May 10 (sow outdoors) | – |
| Cucumber | Mar 1–8 | Apr 5–19 (transplant) Apr 5–19 (sow outdoors) | Aug 16–30 (sowing) |
| Summer squash / zucchini | Mar 1–8 | Apr 5–19 (transplant) Apr 5–19 (sow outdoors) | Aug 16–30 (sowing) |
| Winter squash | Mar 1–8 | Apr 5–19 (transplant) Apr 5–19 (sow outdoors) | – |
| Pumpkin | – | Apr 5–19 (sow outdoors) | – |
| Watermelon | Mar 1–8 | Apr 12–26 (transplant) Apr 12–26 (sow outdoors) | – |
| Cantaloupe / muskmelon | Mar 1–8 | Apr 12–26 (transplant) Apr 12–26 (sow outdoors) | – |
| Okra | Feb 15–Mar 1 | Apr 12–26 (transplant) Apr 12–26 (sow outdoors) | – |
| Celery | Jan 4–18 | Apr 5–12 (transplant) | – |
| Basil | Feb 15–Mar 1 | Apr 5–19 (transplant) Apr 5–19 (sow outdoors) | – |
| Cilantro | – | Mar 15–Apr 12 (sow outdoors) | Sep 13–27 (sowing) |
| Parsley | Jan 18–Feb 1 | Mar 15–29 (transplant) Mar 8–29 (sow outdoors) | – |
| Dill | – | Mar 29–Apr 12 (sow outdoors) | Sep 13–27 (sowing) |
| Sunflower | – | Mar 29–Apr 12 (sow outdoors) | – |
| Asparagus (crowns) | – | Mar 1–15 (transplant) | – |
| Rhubarb (crowns) | – | Mar 1–15 (transplant) | – |
| Strawberry (plants) | – | Mar 1–15 (transplant) | Aug 30–Sep 27 (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: Natl Arboretum Dc, MD (NOAA GHCN-Daily ID USC00186350), elevation 50 ft, 2.8 miles from the ZIP's center point. NOAA completeness flag: S (standard, 24+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Dalecarlia Rsvr, MD | 5 mi | Apr 9 | Oct 31 |
| Washington Reagan AP, VA | 6 mi | Mar 24 | Nov 18 |
| Beltsville, MD | 8 mi | Apr 10 | Nov 1 |
The average last-frost dates of these stations span 17 days, a rough guide to local variation. See data sources & methods.
Frost questions for 20317
When is the last frost in 20317?
The average (50% chance) last spring freeze of 32°F for ZIP 20317 is March 29. For a more cautious planting date, use April 11, when only 1 year in 10 still sees a later freeze.
When is the first frost in 20317?
The average first fall freeze is November 8. In 1 year in 10 it comes by October 26.
What hardiness zone is 20317?
ZIP 20317 is in USDA zone 7b (5 to 10°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 20317 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
20422 Washington 20064 Washington 20542 Washington 20059 Washington 20010 Washington 20017 Washington 20011 Washington 20009 Washington
Other ZIP codes in District of Columbia
20001 20002 20003 20004 20005 20006 20007 20008 20009 20010 20011 20012 20015 20016 20017 20018 20019 20020 20024 20032 20036 20037 20045 20052 All District of Columbia frost dates · District of Columbia frost dates
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