Frost Dates for Johnstown, PA 15904
Johnstown has 6 ZIP codes. The Johnstown, PA frost page lists all of them with their dates.
Last spring frost May 11 · First fall frost October 9 · 151 frost-free days · USDA Zone 6b
ZIP 15904 has about 16,000 people, one of 6 ZIP codes in Johnstown.
Moderate season: 151 frost-free days. Spring frost risk spans April 26–May 26 (30 days). Fall frost risk spans September 25–October 24 (29 days).
Frost probability for 15904
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | May 26 | May 11 | April 26 |
| Fall (first frost) | September 25 | October 9 | October 24 |
Dates come from NOAA 1971–2000 freeze probabilities at INDIANA 3 SE (39.9 km away); the 50% date is the median year.
Which crops fit a 151-day season in Johnstown
In Johnstown (151 frost-free days, a moderate season), 34 of 56 planner crops fit outright, 21 get two plantings, 1 crop is perennial.
| Crop | Start indoors | Plant out / sow | Days you have | Verdict | Last sow date |
|---|---|---|---|---|---|
| Tomato | Apr 6 | May 25–Jun 1 | 109 | fits: 80 days to maturity, 109 available after May 25. | Jun 9 |
| Pepper | Mar 30 | May 25–Jun 1 | 109 | fits: 75 days to maturity, 109 available after May 25. | Jun 14 |
| Lettuce | Mar 16 | Apr 13–Apr 20 | 186 | two-plantings: Plant Apr 13 and again by Aug 18; both mature before Oct 16. | Aug 18 |
| Carrots | — | Apr 20–Apr 27 | 193 | fits: 70 days to maturity, 193 available after Apr 20. | Aug 7 |
| Cucumber | Apr 20 | May 25–Jun 1 | 123 | fits: 60 days to maturity, 123 available after May 25. | Jul 13 |
| Beans | — | May 18–Jun 1 | 137 | two-plantings: Plant May 18 and again by Jul 20; both mature before Oct 2. | Jul 20 |
| Peas | — | Mar 16–May 25 | 214 | fits: 65 days to maturity, 214 available after Mar 16. | Jul 29 |
| Zucchini | Apr 27 | May 25–Jun 1 | 123 | fits: 55 days to maturity, 123 available after May 25. | Jul 18 |
| Onion | Feb 16 | Apr 13–Apr 27 | 186 | fits: 100 days to maturity, 186 available after Apr 13. | — |
| Spinach | — | Mar 16–May 4 | 228 | two-plantings: Plant Mar 16 and again by Sep 6; both mature before Oct 30. | Sep 6 |
| Kale | Mar 2 | Apr 13–Apr 27 | 200 | two-plantings: Plant Apr 13 and again by Aug 22; both mature before Oct 30. | Aug 22 |
| Broccoli | Mar 16 | Apr 13–Apr 27 | 186 | fits: 80 days to maturity, 186 available after Apr 13. | Jul 14 |
| Cabbage | Mar 16 | Apr 13–Apr 27 | 200 | fits: 70 days to maturity, 200 available after Apr 13. | Aug 7 |
| Radish | — | Mar 16–Jun 8 | 214 | two-plantings: Plant Mar 16 and again by Sep 7; both mature before Oct 16. | Sep 7 |
| Beets | — | Mar 16–Jun 8 | 214 | two-plantings: Plant Mar 16 and again by Aug 8; both mature before Oct 16. | Aug 8 |
| Potatoes | — | Apr 27–May 4 | 172 | fits: 90 days to maturity, 172 available after Apr 27. | — |
| Garlic | — | Oct 9 | 256 | overwinter: Plant Oct 9 to Oct 30; harvest the following summer. | Oct 30 |
| Strawberry | — | Apr 6–Jun 1 | 207 | perennial: A perennial: plant Apr 6; it fruits from the following year and keeps producing for several years. | — |
| Corn | Apr 13 | May 18–May 25 | 123 | fits: 75 days to maturity, 123 available after May 18. | Jun 21 |
| Pumpkin | Apr 27 | May 25–May 25 | 116 | fits: 100 days to maturity, 116 available after May 25. | May 27 |
| Cauliflower | Mar 30 | May 4–May 18 | 165 | fits: 75 days to maturity, 165 available after May 4. | Jul 19 |
| Swiss Chard | Mar 16 | Apr 27–Apr 27 | 172 | two-plantings: Plant Apr 27 and again by Aug 8; both mature before Oct 16. | Aug 8 |
| Arugula | — | Mar 16–Jun 8 | 228 | two-plantings: Plant Mar 16 and again by Sep 6; both mature before Oct 30. | Sep 6 |
| Brussel Sprouts | Mar 16 | Apr 13–Apr 27 | 200 | fits: 100 days to maturity, 200 available after Apr 13. | Jul 8 |
| Butternut Squash | Apr 27 | May 25–Jun 1 | 116 | fits: 100 days to maturity, 116 available after May 25. | May 27 |
| Eggplant | Mar 23 | May 25–Jun 1 | 109 | fits: 70 days to maturity, 109 available after May 25. | Jun 19 |
| Okra | Apr 13 | May 18–May 25 | 130 | two-plantings: Plant May 18 and again by Jul 18; both mature before Sep 25. | Jul 18 |
| Basil | Apr 6 | Jun 1–Jun 1 | 116 | fits: 60 days to maturity, 116 available after Jun 1. | Jul 13 |
| Cilantro | — | Apr 13–May 4 | 186 | two-plantings: Plant Apr 13 and again by Aug 13; both mature before Oct 16. | Aug 13 |
| Parsley | Mar 2 | May 18–May 25 | 151 | fits: 70 days to maturity, 151 available after May 18. | Jul 24 |
| Celery | Mar 2 | May 18–Jun 1 | 151 | fits: 120 days to maturity, 151 available after May 18. | Jun 4 |
| Scallions | Mar 2 | Apr 13–Apr 27 | 200 | two-plantings: Plant Apr 13 and again by Aug 17; both mature before Oct 30. | Aug 17 |
| Turnip | — | Apr 13–Apr 27 | 200 | two-plantings: Plant Apr 13 and again by Aug 27; both mature before Oct 30. | Aug 27 |
| Kohlrabi | — | Mar 30–Apr 13 | 214 | two-plantings: Plant Mar 30 and again by Aug 22; both mature before Oct 30. | Aug 22 |
| Bok Choy | Apr 13 | May 4–May 11 | 165 | two-plantings: Plant May 4 and again by Aug 18; both mature before Oct 16. | Aug 18 |
| Collards | Mar 2 | Apr 13–Apr 27 | 200 | two-plantings: Plant Apr 13 and again by Aug 17; both mature before Oct 30. | Aug 17 |
| Cantaloupe | Apr 27 | May 25–Jun 1 | 109 | fits: 85 days to maturity, 109 available after May 25. | Jun 4 |
| Chives | Feb 16 | May 18–May 25 | 165 | fits: 90 days to maturity, 165 available after May 18. | — |
| Dill | — | Mar 16–Jun 8 | 214 | two-plantings: Plant Mar 16 and again by Aug 8; both mature before Oct 16. | Aug 8 |
| Oregano | Mar 2 | May 18–May 25 | 165 | fits: 80 days to maturity, 165 available after May 18. | — |
| Rosemary | Feb 16 | May 18–May 25 | 151 | fits: 80 days to maturity, 151 available after May 18. | — |
| Sage | Mar 16 | May 18–May 25 | 165 | fits: 75 days to maturity, 165 available after May 18. | — |
| Thyme | Mar 2 | May 18–May 25 | 165 | fits: 90 days to maturity, 165 available after May 18. | — |
| Calendula | Mar 30 | Apr 27–May 11 | 172 | two-plantings: Plant Apr 27 and again by Aug 13; both mature before Oct 16. | Aug 13 |
| Cosmos | Apr 13 | May 11–May 25 | 137 | two-plantings: Plant May 11 and again by Jul 13; both mature before Sep 25. | Jul 13 |
| Lavender | Feb 16 | May 11–May 25 | 172 | fits: 90 days to maturity, 172 available after May 11. | — |
| Marigolds | Mar 30 | May 11–May 18 | 137 | two-plantings: Plant May 11 and again by Jul 23; both mature before Sep 25. | Jul 23 |
| Melons | Apr 27 | May 25–Jun 1 | 109 | fits: 85 days to maturity, 109 available after May 25. | Jun 4 |
| Mint | — | May 11–May 25 | 172 | fits: 90 days to maturity, 172 available after May 11. | — |
| Nasturtiums | Apr 13 | May 11–May 18 | 137 | two-plantings: Plant May 11 and again by Jul 18; both mature before Sep 25. | Jul 18 |
| Pole Beans | — | May 18–Jun 1 | 130 | fits: 65 days to maturity, 130 available after May 18. | Jul 8 |
| Spaghetti Squash | Apr 27 | May 25–Jun 1 | 116 | fits: 90 days to maturity, 116 available after May 25. | Jun 6 |
| Sunflowers | — | May 11–May 25 | 137 | fits: 70 days to maturity, 137 available after May 11. | Jul 3 |
| Tomatillos | Mar 16 | May 18–May 25 | 116 | fits: 75 days to maturity, 116 available after May 18. | Jun 14 |
| Watermelon | Apr 27 | May 18–May 25 | 116 | fits: 80 days to maturity, 116 available after May 18. | Jun 9 |
| Yellow Squash | Apr 27 | May 25–Jun 1 | 123 | fits: 55 days to maturity, 123 available after May 25. | Jul 18 |
| Zinnias | Apr 13 | May 11–May 25 | 137 | two-plantings: Plant May 11 and again by Jul 13; both mature before Sep 25. | Jul 13 |
Month by month in Johnstown
| Month | What to do |
|---|---|
| January | Plan your garden layout and order seeds. Research varieties suited to your frost dates. |
| February | Start indoors: Chives (Feb 16), Lavender (Feb 16), Onion (Feb 16), Rosemary (Feb 16). |
| March | Start indoors: Celery (Mar 2), Collards (Mar 2), Kale (Mar 2), Oregano (Mar 2), Parsley (Mar 2), Scallions (Mar 2), +13 more. Direct sow from: Arugula (Mar 16), Beets (Mar 16), Dill (Mar 16), Peas (Mar 16), Radish (Mar 16), Spinach (Mar 16), +1 more. |
| April | Start indoors: Basil (Apr 6), Tomato (Apr 6), Bok Choy (Apr 13), Corn (Apr 13), Cosmos (Apr 13), Nasturtiums (Apr 13), +11 more. Direct sow from: Cilantro (Apr 13), Turnip (Apr 13), Carrots (Apr 20), Potatoes (Apr 27). Transplant from: Broccoli (Apr 13), Brussel Sprouts (Apr 13), Cabbage (Apr 13), Collards (Apr 13), Kale (Apr 13), Lettuce (Apr 13), +4 more. Plant: Strawberry (Apr 6). |
| May | Direct sow from: Sunflowers (May 11), Beans (May 18), Pole Beans (May 18). Transplant from: Bok Choy (May 4), Cauliflower (May 4), Cosmos (May 11), Lavender (May 11), Marigolds (May 11), Mint (May 11), +24 more. Last frost around May 11. Last sowing dates: Butternut Squash (May 27), Pumpkin (May 27). |
| June | Transplant from: Basil (Jun 1). Last sowing dates: Cantaloupe (Jun 4), Celery (Jun 4), Melons (Jun 4), Spaghetti Squash (Jun 6), Tomato (Jun 9), Watermelon (Jun 9), +4 more. |
| July | Last sowing dates: Sunflowers (Jul 3), Brussel Sprouts (Jul 8), Pole Beans (Jul 8), Basil (Jul 13), Cosmos (Jul 13), Cucumber (Jul 13), +11 more. |
| August | Last sowing dates: Cabbage (Aug 7), Carrots (Aug 7), Beets (Aug 8), Dill (Aug 8), Swiss Chard (Aug 8), Calendula (Aug 13), +8 more. |
| September | Last sowing dates: Arugula (Sep 6), Spinach (Sep 6), Radish (Sep 7). |
| October | Direct sow from: Garlic (Oct 9). First frost around October 9. Last sowing dates: Garlic (Oct 30). |
| November | Harvest remaining cold-hardy crops: kale, carrots, and beets. Plant garlic bulbs for next year. |
| December | Clean up spent plants. Add compost to beds. Rest, review, and plan next year's garden. |
Frequently Asked Questions
What is the last frost date for Johnstown, PA (ZIP 15904)?
The median last spring frost date for Johnstown, PA (ZIP code 15904) is around May 11. This is the 50th-percentile date — meaning half of all years see frost end before this date. Use the 10% and 90% dates to understand the full range of risk in your area. One year in ten frost ends before April 26; one in ten it runs past May 26.
What is the first fall frost date in Johnstown, PA?
The median first fall frost date for Johnstown, PA is around October 9. Plan to harvest or protect frost-sensitive crops like tomatoes and peppers at least a week before this date to avoid losses. The first frost arrives around September 25 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in Johnstown, PA?
The frost-free growing season in Johnstown is about 151 days. This window — from your last spring frost to your first fall frost — is when warm-season vegetables thrive. Cold-hardy crops like kale, spinach, and peas can extend your season by weeks on either side. In Johnstown (151 frost-free days, a moderate season), 34 of 56 planner crops fit outright, 21 get two plantings, 1 crop is perennial.
What USDA hardiness zone is Johnstown, PA?
Johnstown, PA is in USDA hardiness zone 6b (2023 USDA Plant Hardiness Zone Map). Zones come from the average coldest winter temperature, so they tell you which perennials survive the winter; the frost dates on this page tell you when to plant.
When should I start tomatoes indoors in Johnstown, PA?
Start tomatoes indoors Apr 6 and plant out May 25 in Johnstown. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Johnstown?
Two: plant Apr 13 and again by Aug 18; both mature before Oct 16.
When do I plant garlic in Johnstown?
Oct 9 to Oct 30; it overwinters and is ready the following summer.
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