Fall in zone 6aPhoto: Dietmar Rabich, CC BY-SA 4.0, via Wikimedia Commons
Frost dates for ZIP 80025 (Eldorado Springs, CO)
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, Gross Rsvr, CO (3 miles away).
- Average last spring frostMay 2450% chance of a 32°F freeze after this date
- Average first fall frostSep 2350% chance of a 32°F freeze by this date
- Growing season (frost-free)120 daysmedian, 32°F threshold
- USDA hardiness zone6a-10 to -5°F avg. coldest night
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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
42°F Below 50°F
24-hour average · latest 41°F, as of Oct 18, 1:00 AM CDT
Measured at NOAA USCRN station Boulder 14 W, 15 mi away. Daily averages: Thu 42°, Fri 40°, Sat 41°.
4-inch depth
42°F Below 50°F
24-hour average · latest 42°F, as of Oct 18, 1:00 AM CDT
Measured at NOAA USCRN station Boulder 14 W, 15 mi away. Daily averages: Thu 44°, Fri 42°, Sat 42°.
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 80025 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
Soil is 42°F at 4 inches. Fall pre-emergent window is mostly past. Next: spring, when soil reaches 50°F (typically mid-April to mid-May).
Fertilizer window
Lawn region: Mountain West and High Plains. 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) | May 11 |
| 50% (the "average" last frost) | May 24 |
| 10% (cautious: only 1 year in 10 freezes later) | Jun 10 |
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 9 |
| 50% (the "average" first frost) | Sep 23 |
| 90% (late: most years have frozen by now) | Oct 6 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | Jun 7 | Sep 13 |
| 32°F (freeze) | May 24 | Sep 23 |
| 28°F (hard freeze) | May 10 | Oct 3 |
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 80025
Dates count from your average last spring frost (May 24) and first fall frost (Sep 23). 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 29–Apr 12 | May 31–Jun 14 (transplant) | – |
| Pepper (sweet and hot) | Mar 15–29 | Jun 7–21 (transplant) | – |
| Eggplant | Mar 15–29 | Jun 7–21 (transplant) | – |
| Tomatillo | Mar 29–Apr 12 | May 31–Jun 14 (transplant) | – |
| Lettuce | Mar 29–Apr 12 | May 3–24 (transplant) Apr 26–Jun 7 (sow outdoors) | Jul 29–Aug 19 (transplant) Jul 15–Aug 12 (sowing) |
| Spinach | – | Apr 12–May 3 (sow outdoors) | Jul 29–Aug 19 (sowing) |
| Kale | Mar 29–Apr 12 | Apr 26–May 10 (transplant) Apr 26–May 10 (sow outdoors) | Jul 1–29 (transplant) Jun 17–Jul 15 (sowing) |
| Collards | Mar 29–Apr 12 | Apr 26–May 24 (transplant) Apr 26–May 24 (sow outdoors) | Jul 1–29 (transplant) Jun 17–Jul 15 (sowing) |
| Broccoli | Mar 15–29 | Apr 26–May 10 (transplant) | Jun 17–Jul 15 (transplant) |
| Cabbage | Mar 15–29 | Apr 26–May 10 (transplant) | Jun 17–Jul 15 (transplant) |
| Cauliflower | Mar 15–29 | May 10–24 (transplant) | Jun 17–Jul 15 (transplant) |
| Brussels sprouts | Mar 1–15 | Apr 26–May 10 (transplant) | Jun 3–24 (transplant) |
| Kohlrabi | Mar 29–Apr 12 | Apr 26–May 10 (transplant) Apr 26–May 10 (sow outdoors) | Jul 15–29 (sowing) |
| Bok choy / Asian greens | – | Apr 26–May 10 (sow outdoors) | Jul 29–Aug 12 (sowing) |
| Arugula | – | Apr 26–May 24 (sow outdoors) | Jul 29–Aug 26 (sowing) |
| Mustard greens | – | Apr 26–May 17 (sow outdoors) | Jul 29–Aug 12 (sowing) |
| Swiss chard | Apr 12–26 | May 10–31 (transplant) May 10–Jun 7 (sow outdoors) | Jul 15–29 (sowing) |
| Beet | – | Apr 26–May 24 (sow outdoors) | Jul 15–29 (sowing) |
| Carrot | – | May 3–31 (sow outdoors) | Jul 1–15 (sowing) |
| Radish | – | Apr 19–May 31 (sow outdoors) | Aug 12–26 (sowing) |
| Turnip | – | Apr 26–May 17 (sow outdoors) | Jul 15–29 (sowing) |
| Parsnip | – | May 3–24 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Mar 29–Apr 26 (sow outdoors) | Jul 1–15 (sowing) |
| Onion (bulbing) | Mar 1–15 | Apr 12–26 (transplant) | – |
| Green onion / scallion | – | Apr 12–May 10 (sow outdoors) | Jul 15–29 (sowing) |
| Leek | Mar 1–15 | Apr 26–May 10 (transplant) | – |
| Garlic | – | – | Aug 12–Sep 9 (sowing) |
| Shallot | – | Apr 12–26 (transplant) | Aug 12–Sep 9 (sowing) |
| Potato | – | Apr 26–May 10 (transplant) | Jun 3–17 (transplant) |
| Sweet potato | – | Jun 14–28 (transplant) | – |
| Sweet corn | – | May 31–Jun 14 (sow outdoors) | – |
| Bean, bush (snap) | – | May 31–Jun 14 (sow outdoors) | – |
| Bean, pole | – | May 31–Jun 14 (sow outdoors) | – |
| Lima bean | – | Jun 7–21 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Jun 14–Jul 5 (sow outdoors) | – |
| Cucumber | Apr 26–May 3 | May 31–Jun 14 (transplant) May 31–Jun 14 (sow outdoors) | – |
| Summer squash / zucchini | Apr 26–May 3 | May 31–Jun 14 (transplant) May 31–Jun 14 (sow outdoors) | – |
| Winter squash | Apr 26–May 3 | May 31–Jun 14 (transplant) May 31–Jun 14 (sow outdoors) | – |
| Pumpkin | – | May 31–Jun 14 (sow outdoors) | – |
| Watermelon | Apr 26–May 3 | Jun 7–21 (transplant) Jun 7–21 (sow outdoors) | – |
| Cantaloupe / muskmelon | Apr 26–May 3 | Jun 7–21 (transplant) Jun 7–21 (sow outdoors) | – |
| Okra | Apr 12–26 | Jun 7–21 (transplant) Jun 7–21 (sow outdoors) | – |
| Celery | Mar 1–15 | May 31–Jun 7 (transplant) | – |
| Basil | Apr 12–26 | May 31–Jun 14 (transplant) May 31–Jun 14 (sow outdoors) | – |
| Cilantro | – | May 10–Jun 7 (sow outdoors) | Jul 29–Aug 12 (sowing) |
| Parsley | Mar 15–29 | May 10–24 (transplant) May 3–24 (sow outdoors) | – |
| Dill | – | May 24–Jun 7 (sow outdoors) | Jul 29–Aug 12 (sowing) |
| Sunflower | – | May 24–Jun 7 (sow outdoors) | – |
| Asparagus (crowns) | – | Apr 26–May 10 (transplant) | – |
| Rhubarb (crowns) | – | Apr 26–May 10 (transplant) | – |
| Strawberry (plants) | – | Apr 26–May 10 (transplant) | Jul 15–Aug 12 (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.
Plants that do well here
Colorado has a university or garden plant program: Plant Select®. Plant frost-tender annuals after May 24 here (the average last frost). Not affiliated with the program.
Where these numbers come from
Station: Gross Rsvr, CO (NOAA GHCN-Daily ID USC00053629), elevation 7,970 ft, 2.8 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Boulder, CO | 5 mi | May 6 | Oct 5 |
| Coal Creek Canyon, CO | 5 mi | Jun 5 | Sep 16 |
| Ralston Rsvr, CO | 7 mi | May 3 | Oct 14 |
The average last-frost dates of these stations span 33 days, a rough guide to local variation. See data sources & methods.
Frost questions for 80025
When is the last frost in 80025?
The average (50% chance) last spring freeze of 32°F for ZIP 80025 is May 24. For a more cautious planting date, use June 10, when only 1 year in 10 still sees a later freeze.
When is the first frost in 80025?
The average first fall freeze is September 23. In 1 year in 10 it comes by September 9.
What hardiness zone is 80025?
ZIP 80025 is in USDA zone 6a (-10 to -5°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 80025 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
80305 Boulder 80310 Boulder 80303 Boulder 80471 80007 Arvada 80403 Coal Creek 80302 Lazy Acres 80027 Louisville
Other ZIP codes in Boulder County
80026 80027 80301 80302 80303 80304 80305 80310 80455 80466 80471 80481 80501 80503 80510 80540 80544 All Boulder County frost dates · Colorado 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.